{"id":412,"date":"2020-11-30T13:19:56","date_gmt":"2020-11-30T04:19:56","guid":{"rendered":"http:\/\/stevenoh0908.kro.kr\/blog\/?p=412"},"modified":"2021-05-13T12:31:45","modified_gmt":"2021-05-13T03:31:45","slug":"%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0","status":"publish","type":"post","link":"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/","title":{"rendered":"\ub370\uc774\ud130\uacfc\ud559 \ud0d0\uad6c\ub178\ud2b8 &#8211; Mathematical Basis #1. \ud589\ub82c\uacfc \ubca1\ud130"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-style-default is-layout-flow wp-block-quote-is-layout-flow\"><p>&#8216;\ub370\uc774\ud130\uacfc\ud559 \ud0d0\uad6c\ub178\ud2b8&#8217; \uc2dc\ub9ac\uc988\ub294 \uce74\ud398\uc9c0\uae30 \ucee4\ud53c\uc0ac\uc720\uac00 7\ub144\ub3d9\uc548 \uc544\ub9c8\ucd94\uc5b4 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \ucde8\ubbf8\uc0bc\uc544 \uc990\uae30\ub2e4\uac00, \ubd80\ub7b4\ubd80\ub7b4 \uc2dc\uc791\ud55c &#8216;\ub370\uc774\ud130\uacfc\ud559&#8217; \uacf5\ubd80 \uc77c\uc9c0\uc785\ub2c8\ub2e4.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub9c9\uc0c1 \ub370\uc774\ud130\uacfc\ud559\uc744 \uc2dc\uc791\ud558\ub2c8 \ucc98\uc74c \ub9de\ub2e5\ub728\ub9ac\ub294 \uac83\uc740 \ubc14\ub85c \ud589\ub82c. \uc77c\ubc18\uc801\uc73c\ub85c \ud589\ub82c\uc740 \uc608\uc804 \uac1c\uc815 \uc774\uc804\uc758 \uace0\ub4f1\ud559\uad50 \uad50\uc721 \uacfc\uc815\uc5d0 \uc788\uc5c8\ub294\ub370, \uc9c0\ub09c \ubc88 \uac1c\uc815\uc774\uc5c8\ub098, \uc9c0\uc9c0\ub09c\ubc88 \uac1c\uc815\uc774\uc5c8\ub098 \uc5ec\ud2bc \uac1c\uc815\ud558\uba74\uc11c \ube60\uc838\ubc84\ub9b0 \uc548\ud0c0\uae4c\uc6b4 \uc218\ud559 \uc9c0\uc2dd\ub4e4\uc774\ub2e4. \uac8c\ub2e4\uac00, \ud589\ub82c\uc801\uc73c\ub85c \uc811\uadfc\ud558\ub294 \ubca1\ud130\uc758 \uae30\uc220\uc774\ub098 \uc5f0\uc0b0\uc758 \uacbd\uc6b0\ub3c4 \ud568\uaed8 \ube60\uc838\ubc84\ub9b0 \ub355\uc5d0, \ucc98\uc74c \uc774\ub4e4\uc744 \ubcf4\uace0 \ud544\uc790\ub294 \ub2f9\ud669\ud560 \uc218 \ubc16\uc5d0 \uc5c6\uc5c8\ub2e4. \ud558\uc9c0\ub9cc \ub2e4\ud589\ud788\ub3c4 <a href=\"https:\/\/www.coursera.org\/search?query=machine%20learning\" target=\"_blank\" rel=\"noreferrer noopener\">Coursera \uac15\uc88c<\/a>\uc5d0\uc11c \uc798 \uc18c\uac1c\ud574\uc8fc\uace0 \uc788\uae30\uc5d0, \uc5ec\ud2bc \uc5b4\ub5bb\uac8c\ub4e0 \ubc30\uc6cc\uc11c \uc774\ub807\uac8c \uc815\ub9ac\ud560 \uc218 \uc788\uac8c \ub418\uc5c8\ub2e4.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC\" >\ud589\ub82c<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%EC%A0%95%EC%9D%98\" >\ud589\ub82c\uc758 \uc815\uc758<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%EC%84%B1%EB%B6%84_%ED%96%89%EA%B3%BC_%EC%97%B4_%EA%B7%B8%EB%A6%AC%EA%B3%A0_%ED%81%AC%EA%B8%B0\" >\ud589\ub82c\uc758 \uc131\ubd84, \ud589\uacfc \uc5f4, \uadf8\ub9ac\uace0 \ud06c\uae30<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%EC%84%B1%EB%B6%84%EA%B3%BC_%ED%96%89%EB%A0%AC%EC%9D%84_%EA%B8%B0%ED%98%B8%EB%A1%9C_%EC%93%B0%EB%8A%94_%EB%B0%A9%EB%B2%95\" >\ud589\ub82c\uc758 \uc131\ubd84\uacfc, \ud589\ub82c\uc744 \uae30\ud638\ub85c \uc4f0\ub294 \ubc29\ubc95<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%ED%96%89%EA%B3%BC_%EC%97%B4_%EA%B7%B8%EB%A6%AC%EA%B3%A0_%ED%8A%B9%EC%A0%95_%ED%96%89%EA%B3%BC_%EC%97%B4_%EC%9C%84%EC%B9%98%EC%9D%98_%EC%84%B1%EB%B6%84_%ED%91%9C%ED%98%84%EB%B2%95\" >\ud589\ub82c\uc758 \ud589\uacfc \uc5f4, \uadf8\ub9ac\uace0 \ud2b9\uc815 \ud589\uacfc \uc5f4 \uc704\uce58\uc758 \uc131\ubd84 \ud45c\ud604\ubc95<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%ED%81%AC%EA%B8%B0\" >\ud589\ub82c\uc758 \ud06c\uae30<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%EA%B8%B0%EB%B3%B8_%EC%97%B0%EC%82%B0_%E2%80%93_%ED%96%89%EB%A0%AC%ED%95%A9_%ED%96%89%EB%A0%AC%EC%B0%A8_%ED%96%89%EB%A0%AC%EC%9D%98_%EC%8A%A4%EC%B9%BC%EB%9D%BC%EA%B3%B1_%ED%96%89%EB%A0%AC%EA%B3%B1\" >\ud589\ub82c\uc758 \uae30\ubcf8 \uc5f0\uc0b0 &#8211; \ud589\ub82c\ud569, \ud589\ub82c\ucc28, \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1, \ud589\ub82c\uacf1<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%ED%95%A9\" >\ud589\ub82c\ud569<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%B0%A8\" >\ud589\ub82c\ucc28<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EC%9D%98_%EC%8A%A4%EC%B9%BC%EB%9D%BC%EA%B3%B1\" >\ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%ED%96%89%EB%A0%AC%EA%B3%B1\" >\ud589\ub82c\uacf1<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EC%A0%95%EC%82%AC%EA%B0%81%ED%96%89%EB%A0%AC_%EC%98%81%ED%96%89%EB%A0%AC_%EB%8C%80%EA%B0%81%ED%96%89%EB%A0%AC_%EB%8B%A8%EC%9C%84%ED%96%89%EB%A0%AC_%EC%A0%84%EC%B9%98%ED%96%89%EB%A0%AC\" >\uc815\uc0ac\uac01\ud589\ub82c, \uc601\ud589\ub82c, \ub300\uac01\ud589\ub82c, \ub2e8\uc704\ud589\ub82c, \uc804\uce58\ud589\ub82c<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EC%A0%95%EC%82%AC%EA%B0%81%ED%96%89%EB%A0%AC\" >\uc815\uc0ac\uac01\ud589\ub82c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EC%98%81%ED%96%89%EB%A0%AC\" >\uc601\ud589\ub82c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EB%8C%80%EA%B0%81%ED%96%89%EB%A0%AC\" >\ub300\uac01\ud589\ub82c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EB%8B%A8%EC%9C%84%ED%96%89%EB%A0%AC\" >\ub2e8\uc704\ud589\ub82c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EC%A0%84%EC%B9%98%ED%96%89%EB%A0%AC\" >\uc804\uce58\ud589\ub82c<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EB%B2%A1%ED%84%B0\" >\ubca1\ud130<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EB%B2%A1%ED%84%B0%EC%99%80_%ED%96%89%EB%A0%AC\" >\ubca1\ud130\uc640 \ud589\ub82c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/stevenoh0908.pe.kr\/blog\/knowledges\/%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b3%bc%ed%95%99-%ed%83%90%ea%b5%ac%eb%85%b8%ed%8a%b8-mathematical-basis-1-%ed%96%89%eb%a0%ac%ea%b3%bc-%eb%b2%a1%ed%84%b0\/#%EB%B2%A1%ED%84%B0%EC%9D%98_%EB%82%B4%EC%A0%81%EA%B3%BC_%ED%96%89%EB%A0%AC%EA%B3%B1\" >\ubca1\ud130\uc758 \ub0b4\uc801\uacfc \ud589\ub82c\uacf1<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC\"><\/span>\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%EC%A0%95%EC%9D%98\"><\/span>\ud589\ub82c\uc758 \uc815\uc758<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c(\u884c\u5217, Matrix)<\/strong>\ub780 \ubcc4 \uac83\uc774 \uc544\ub2c8\uace0, \uadf8\ub0e5 \ub2e8\uc9c0 \uc218 \ub610\ub294 \uc2dd\uc744 \uc9c1\uc0ac\uac01\ud615\uc758 \ud615\ud0dc\ub85c \ubc30\uc5f4\ud574\ub193\uc740 \uac83\uc744 \uc77c\uceeb\ub294 \uc6a9\uc5b4\uc774\ub2e4. \uc608\uc2dc\ub97c \ud1b5\ud558\uc5ec \uc0b4\ud3b4\ubcf4\uc790\uba74, \ub2e4\uc74c\uc758 \uac83\ub4e4\uc740 \ubaa8\ub450 \ud589\ub82c\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} a &amp; b \\\\ c &amp; d \\end{bmatrix}$, $\\begin{bmatrix} -1 &amp; 10 \\\\ 5 &amp; 7 \\over 2 \\end{bmatrix}$, $\\begin{bmatrix} x^{2} + 5x + 10 &amp; -2x \\\\ 10 &amp; e^{x} \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub370\uc774\ud130\uacfc\ud559\uc5d0\uc11c\ub294, \ud2b9\ud788 \uadf8 \uc911\uc5d0\uc11c \uba38\uc2e0\ub7ec\ub2dd \ubd84\ub958\uae30\ub098 \ub525 \ub7ec\ub2dd\uc758 \ubd84\uc57c\uc5d0\uc11c\ub294, \ud589\ub82c\uc774 \ud2b9\ud788 \uc5b4\ub5a4 \ud568\uc218\ub97c \ud45c\ud604\ud558\uac70\ub098 \uc5f0\uc0b0\ud558\ub294\ub370 \uc788\uc5b4 \ud2b9\ud6a8\uc57d \uc218\uc900\uc73c\ub85c \ud0c1\uc6d4\ud558\uae30 \ub54c\ubb38\uc5d0 \uc774\ub97c \uc990\uaca8 \uc0ac\uc6a9\ud55c\ub2e4. \uc5b4\ub5a4 \uc7a5\uc810\uc774 \uc788\uae38\ub798 \uc774\ub4e4\uc744 \uadf8\ub807\uac8c\ub098 \uc560\uc6a9\ud558\ub294\uc9c0\ub294 \ucd94\ud6c4\uc5d0 \ucc9c\ucc9c\ud788 \uc0b4\ud3b4\ubcf4\uae30\ub85c \ud558\uace0, \uc6b0\uc120\uc740 \ud589\ub82c\uc5d0 \ub300\ud55c \uae30\ucd08 \uc5f0\uc0b0\uc744 \ub3c4\ub300\uccb4 \uc5b4\ub5bb\uac8c \ud558\ub294\uc9c0\ubd80\ud130 \uc0b4\ud3b4\ubcf4\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%EC%84%B1%EB%B6%84_%ED%96%89%EA%B3%BC_%EC%97%B4_%EA%B7%B8%EB%A6%AC%EA%B3%A0_%ED%81%AC%EA%B8%B0\"><\/span>\ud589\ub82c\uc758 \uc131\ubd84, \ud589\uacfc \uc5f4, \uadf8\ub9ac\uace0 \ud06c\uae30<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud558\uc9c0\ub9cc \ud589\ub82c\uc5d0 \ub300\ud55c \uae30\ucd08 \uc5f0\uc0b0\uc744 \uc124\uba85\ud558\uae30 \uc804\uc5d0 \uba3c\uc800 \uc120\ud589\ub418\uc5b4\uc57c \ud560 \uac83\uc774 \uc788\uc73c\ub2c8, \ud589\ub82c\uc744 \uc5b4\ub5bb\uac8c \uae30\ud638\ub85c \uc4f0\uace0, \uadf8 \ub0b4\ubd80\uc5d0 \uc788\ub294 \uc131\ubd84(\uc6d0\uc18c)\ub4e4\uc744 \uc5b4\ub5bb\uac8c \uae30\ud638\ub85c \ud45c\ud604\ud558\ub294\uc9c0, \uadf8\ub9ac\uace0 \uc774 \ud589\ub82c\uc758 \ud06c\uae30\ub97c \uc5b4\ub5bb\uac8c \uce21\uc815\ud558\ub294\uc9c0\ub97c \ud589\ub82c\uc758 \ud589\uacfc \uc5f4\uc5d0 \ub300\ud55c \uc815\uc758\uc640 \ud568\uaed8 \uc0b4\ud3b4\ubcf4\ub294 \uac83\uc774 \ubc14\ub85c \uadf8\uac83\uc774\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%EC%84%B1%EB%B6%84%EA%B3%BC_%ED%96%89%EB%A0%AC%EC%9D%84_%EA%B8%B0%ED%98%B8%EB%A1%9C_%EC%93%B0%EB%8A%94_%EB%B0%A9%EB%B2%95\"><\/span>\ud589\ub82c\uc758 \uc131\ubd84\uacfc, \ud589\ub82c\uc744 \uae30\ud638\ub85c \uc4f0\ub294 \ubc29\ubc95<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc77c\ubc18\uc801\uc73c\ub85c \uc218\ud559\uc801 \uae30\ud638\ub85c \ud589\ub82c\uc740 \ubcf4\ud1b5 \uc54c\ud30c\ubcb3 \ub300\ubb38\uc790\uc758 \ud615\ud0dc\ub85c \ud45c\ud604\ud55c\ub2e4. \uc989, \uc774\ub97c\ud14c\uba74:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; 2 \\\\ 3 &amp; 4 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc758 \uc2dd\uc778 \uc148\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uc758 <strong>\uc131\ubd84(Entry)<\/strong>\uc774\ub77c \ud568\uc740, \ud589\ub82c \uc548\uc5d0 \ub298\uc5b4\uc838\uc788\ub294 \uac1c\uac1c\uc758 \uad6c\uc131 \uc694\uc18c\ub4e4\uc744 \uc9c0\uc2dc\ud558\ub294 \uc6a9\uc5b4\uc774\ub2e4. \uc774\ub97c\ud14c\uba74 \uc704\uc5d0 \uc81c\uc2dc\ud55c \ud589\ub82c $A$\uc5d0 \ub300\ud558\uc5ec, \uadf8 \uc131\ubd84\uc5d0\ub294 1, 2, 3, 4\uac00 \uc788\ub294 \uc148\uc774\ub2e4. \uc2e4\uc81c\ub85c \uae30\ud638\ub85c, \ud589\ub82c \uc18d \uc5b4\ub290 \ud2b9\uc815 \uc704\uce58\uc5d0\uc11c\uc758 \uc131\ubd84\uc744 \uae30\ud638\ub85c \uc9c0\uc2dc\ud560 \uc218 \uc788\ub294\ub370, \uc774\uac83\uc5d0 \ub300\ud574\uc11c\ub294 \ud589\ub82c\uc758 \ud589\uacfc \uc5f4\uc5d0 \ub300\ud574\uc11c \uc0b4\ud3b4\ubcf4\uba74\uc11c \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%ED%96%89%EA%B3%BC_%EC%97%B4_%EA%B7%B8%EB%A6%AC%EA%B3%A0_%ED%8A%B9%EC%A0%95_%ED%96%89%EA%B3%BC_%EC%97%B4_%EC%9C%84%EC%B9%98%EC%9D%98_%EC%84%B1%EB%B6%84_%ED%91%9C%ED%98%84%EB%B2%95\"><\/span>\ud589\ub82c\uc758 \ud589\uacfc \uc5f4, \uadf8\ub9ac\uace0 \ud2b9\uc815 \ud589\uacfc \uc5f4 \uc704\uce58\uc758 \uc131\ubd84 \ud45c\ud604\ubc95<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uc5d0\uc11c <strong>\ud589(\u884c, Row)<\/strong>\uc774\ub098 <strong>\uc5f4(\uf99c, Column)<\/strong>\uc744 \uc0dd\uac01\ud560 \uc801\uc5d0\ub294 \uadf8\ub0e5 \uc6b0\ub9ac\uac00 \ud754\ud788 \uc4f0\ub294 \uc77c\ubc18\uc801\uc778 \ud45c(Table)\ub97c \uc0dd\uac01\ud558\ub294 \uac8c \ud3b8\ud558\ub2e4. \ud45c\uc5d0\uc11c \uc5b4\ub5a4 \uce78\uc758 \uc704\uce58\ub97c \uc774\uc57c\uae30\ud560 \ub54c \uc6b0\ub9ac\ub294 \ud754\ud788\ub4e4 \uba87 \ud589 \uba87 \uc5f4 \uce78\uc774\ub77c\uace0 \uc774\uc57c\uae30\ud558\ub294\ub370, \ud589\ub82c\ub3c4 \ubcc4 \ub2e4\ub97c \uac83\uc774 \uc5c6\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\ub97c\ud14c\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \ud589\ub82c\uc774 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 10 &amp; -2 &amp; 7 \\\\ 4 &amp; 9 &amp; -2 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc704\uc758 \ud589\ub82c $A$\uc5d0\uc11c, 1\ud589 2\uc5f4\uc758 \uc131\ubd84\ub294 \ubb34\uc5c7\uc778\uac00? \uadf8\ub807\ub2e4. \ubc14\ub85c -2\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud55c\ubc88 \ub354 \ud574\ubcf4\uc790, \ud589\ub82c $A$\uc5d0\uc11c, 2\ud589 1\uc5f4\uc758 \uc131\ubd84\uc740 \ubb34\uc5c7\uc778\uac00? \uadf8\ub807\ub2e4. \ubc14\ub85c 4\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud558\uc9c0\ub9cc \uc218\ud559\uc790\ub4e4\uc740 \ud589\ub82c\uc5d0\uc11c \uc800 4\ub97c \uc9c0\uce6d\ud558\uace0 \uc2f6\uc744 \ub54c, &#8216;\ud589\ub82c $A$\uc758 2\ud589 1\uc5f4\uc758 \uc131\ubd84&#8217;\uc774\ub77c\ub294 \ub354\ub7fd\uac8c \uae30\ub098\uae34 \uc124\uba85\uc744 \ubd99\uc774\ub294 \uac83\uc744 \uc88b\uc544\ud558\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0, \ub2e4\uc74c\uc758 \uae30\ud638\ub97c \ud1b5\ud574\uc11c, \uc5b4\ub5a4 \ud589\ub82c\uc758 \ud2b9\uc815 \uc131\ubd84\uc744 \ud45c\ud604\ud558\uae30\ub85c \uc57d\uc18d\ud574\ubc84\ub838\ub2e4. \uadf8\ub4e4\uc774 \uc57d\uc18d\ud55c \uae30\ud638\uc5d0 \ub530\ub974\uba74, \ud589\ub82c $A$\uc758 2\ud589 1\uc5f4\uc758 \uc131\ubd84\uc774 4\ub77c\ub294 \uc0ac\uc2e4\uc740 \ub2e4\uc74c\uc758 \uae30\ud638\ub85c \ud45c\uc2dc\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$a_{ 2 1 } = 4$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc5ec\uae30\uc11c $a_{ 2 1 }$\uc740 \uc5b4\ub5a4 \ud2b9\uc815\ud55c \ud568\uc218\ub098 \uc5f0\uc0b0\uc790\uc758 \ud45c\uc2dc\uac00 \uc544\ub2c8\ub2e4. \uadf8\ub0e5 \uae30\ud638\uc77c \ubfd0\uc774\uace0, $b_{ 2 1 }$\uc774\ub098 $x_{ 2 1 }$\uacfc \uac19\uc774 \ud45c\ud604\ud574\ub3c4 \uc0c1\uad00\uc774 \uc5c6\ub2e4. \ud558\uc9c0\ub9cc \uc77c\ubc18\uc801\uc73c\ub85c \uc5b4\ub5a4 \ud589\ub82c\uc758 \uc131\ubd84\uc774\ub77c\ub294 \uac83\uc744 \ud45c\uc2dc\ud574\uc8fc\uae30 \uc704\ud574, \uadf8 \ud589\ub82c\uc758 \ubb38\uc790\uc758 \uc18c\ubb38\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud45c\uc2dc\ud558\ub294 \uac83\uc774 \uad00\ub840\uc774\ub2e4. \uc989, \uc608\ucee8\ub300 \ud589\ub82c $A$\uc758 $i$\ud589 $j$\uc5f4 \uc131\ubd84\uc740 $a_{i j}$\uc640 \uac19\uc774 \ud45c\ud604\ud558\ub294 \uc2dd\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uba87 \uac00\uc9c0 \uc5f0\uc2b5\uc744 \ud1b5\ud574 \uc775\uc219\ud574\uc838\ubcf4\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc55e\uc11c \uc81c\uc2dc\ud588\ub358 \ud589\ub82c $A$\ub97c \uc0dd\uac01\ud574\ubcf4\uae30\ub85c \ud558\uc790. $a_{1 1}$\uc740 \uc5bc\ub9c8\uc778\uac00? \uadf8\ub807\ub2e4. 10\uc774\ub2e4. $a_{2 3}$\uc740 \uc5bc\ub9c8\uc778\uac00? \uadf8\ub807\ub2e4. -2\uc774\ub2e4. \uadf8\ub807\ub2e4\uba74, $a_{3 2}$\ub294 \uc5bc\ub9c8\uc778\uac00? \uadf8\ub807\ub2e4. \uc815\uc758\ub418\uc9c0 \uc54a\uc558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub9c9\uc0c1, \ubcf5\uc7a1\ud574\ubcf4\uc774\ub294 \uac83\ub3c4 \ub72f\uc5b4\ubcf4\uba74 \ub2e8\uc21c\ud55c \uacbd\uc6b0\uac00 \ub9ce\uc740 \uac83 \uac19\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%ED%81%AC%EA%B8%B0\"><\/span>\ud589\ub82c\uc758 \ud06c\uae30<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc218\ud559\uc790\ub4e4\uc740 \uc628\uac16 \uac83\uc5d0 \uc774\ub984\uacfc \uc6a9\uc5b4\ub97c \uac16\ub2e4 \ubd99\uc774\uae30\ub97c \uc88b\uc544\ud55c\ub2e4. \uc774\ub984\uc744 \ubd99\uc774\ub294 \ud2b9\uc131\uc740 \uc778\ub958 \uc804\uccb4\uc758 \ubcf4\ud3b8\uc801 \ud2b9\uc131\uc77c\uc9c0\ub3c4 \ubaa8\ub974\uaca0\uc9c0\ub9cc, \uc218\ud559\uc790\ub4e4\uc740 \uadf8\ub7ec\ud55c \uc695\ub9dd\uc774 \ud2b9\ud788\ub098 \uc2ec\ud55c \ud3b8\uc774\ub2e4. \uc774\ub4e4\uc740 \ud589\ub82c\uc5d0 \ub300\ud574\uc11c, \uadf8 &#8216;\ud06c\uae30&#8217;\ub77c\ub294 \uac83\uc744 \uc815\uc758\ud574\ub193\uc558\ub294\ub370, \uc0ac\uc2e4 \uc774 \ud589\ub82c\uc758 \ud06c\uae30\ub77c \ud558\ub294 \uac83\uc740 \ubcc4\ub85c \uc5b4\ub824\uc6b4 \uac83\uc740 \ub2e4\ud589\ud788\ub3c4 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c\uc758 \ud06c\uae30<\/strong>\uc5d0 \ub300\ud558\uc5ec \ub17c\ud560 \uc801\uc5d0\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\ub85c, \uc55e\uc11c \ud589\ub82c\uc758 \ud589\uacfc \uc5f4\uc744 \uc124\uba85\ud558\ub358 \ub54c\uc640 \ub9c8\ucc2c\uac00\uc9c0\uc778, \ud45c\ub97c \ub5a0\uc62c\ub9ac\uba74 \uad49\uc7a5\ud788 \ud3b8\ud558\ub2e4. \ud45c\uc758 \ud06c\uae30\ub97c \uc774\uc57c\uae30\ud55c\ub2e4\uace0 \uc0dd\uac01\ud574\ubcf4\uc790. \uc608\ucee8\ub300, 20\ud589 3\uc5f4\uc758 \ud45c\ub97c \ub5a0\uc62c\ub824\ubcf4\ub77c\uace0 \ud55c\ub2e4\uba74, \uba38\ub9bf\uc18d\uc5d0 3\uce78\uc774 \uc606\uc73c\ub85c \ub298\uc5b4\uc11c\ub294 20\uac1c\uc758 \uc904\ub85c \uc774\ub8e8\uc5b4\uc9c4 \ud45c\uac00 \uc0dd\uac01\ub0a0 \uac83\uc774\ub2e4. \uadf8\ub807\ub2e4. \ud45c\uc758 \ud06c\uae30\ub97c \ud45c\ud604\ud560 \uc801\uc5d0 \uc6b0\ub9ac\ub294 \ud589\uc758 \uac1c\uc218\uc640 \uc5f4\uc758 \uac1c\uc218\ub97c \uc774\uc6a9\ud558\uc5ec \ud45c\uc758 \ud06c\uae30\ub97c \ud45c\ud604\ud588\ub2e4. \uc774\ub7ec\ud55c \ub17c\uc758\ub294 \ub611\uac19\uc774 \ud589\ub82c\uc5d0\ub3c4 \uc801\uc6a9\ub41c\ub2e4. \uc989, \ud589\ub82c\uc758 \ud06c\uae30 \uc5ed\uc2dc, \ud589\ub82c\uc5d0\uc11c \ud589\uacfc \uc5f4\uc758 \uac1c\uc218\ub97c \uc774\uc6a9\ud558\uc5ec \ud589\ub82c\uc758 \ud06c\uae30\ub97c \ud45c\ud604\ud55c\ub2e4\ub294 \uac83\uc774\ub2e4. \uc774\ub97c\ud14c\uba74<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$B = \\begin{bmatrix} 3 &amp; 7 &amp; 10 \\\\ -4 &amp; 11 &amp; 22 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub85c \uc815\uc758\ub41c \ud589\ub82c $B$\uac00 \uc788\ub2e4\uba74, \uc774 \ud589\ub82c $B$\uc758 \ud06c\uae30\ub294 &#8216;2\ud589 3\uc5f4&#8217;\uc778 \uc148\uc774\ub2e4. \ud558\uc9c0\ub9cc \uc6b0\ub9ac\uc758 \uadc0\ucc28\ub2c8\uc2a4\ud2b8\uc778 \uc218\ud559\uc790\ub4e4\uc740 \uc774\ub807\uac8c \ub9d0\ud558\uae30\ub3c4 \uc2eb\uc5b4\uc11c, \uc601\ubbf8\uad8c\uc758 \ud55c \ub2e8\uc5b4\ub97c \uc774\uc6a9\ud558\uc5ec \uc774\uac83\ub3c4 \ucd95\uc57d\ud574\ubc84\ub9ac\ub294\ub370\ub2e4\uac00 \ud06c\uae30\ub97c \ud45c\ud604\ud558\ub294 \uae30\ud638\ub3c4 \ub9cc\ub4e4\uc5b4\ubc84\ub9b0\ub2e4. \uadf8\ub4e4\uc774 \ud45c\ud604\ud55c \ubc14\uc5d0 \ub530\ub974\uba74, \uc704\uc758 \ud589\ub82c $B$\uc758 \ud06c\uae30\ub294 \ub2e4\uc74c\uc758 \uae30\ud638\ub85c \uc4f0\uace0, \ub2e4\uc74c\uacfc \uac19\uc774 \uc77d\ub294\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$2 \\times 3$, 2 by 3<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc989, \uc6b0\ub9ac\uac00 \ud754\ud788 \ud45c\uc758 \ud06c\uae30\ub97c \ud45c\ud604\ud560 \ub54c $4 \\times 5$ \ud06c\uae30\uc758 \ud45c\ub77c\uace0 \ud558\ub294 \uac83\ucc98\ub7fc, \ud589\ub82c\uc758 \ud06c\uae30\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\ub85c $\\times$ \uae30\ud638\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud45c\ud604\ud558\ub294\ub370, \uc601\ubbf8\uad8c\uc5d0\uc11c \ud589\ub82c\uc774 \ucc98\uc74c \ucc3d\uc791\ub418\uc5c8\ub358 \ub9cc\ud07c, \uc77d\uc5b4\ubc84\ub9b4 \ub54c\ub294 \uc601\ub2e8\uc5b4 &#8216;by&#8217;\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc77d\uc5b4\ubc84\ub9ac\ub294 \uac83\uc774\ub2e4. \ubcf4\ud1b5\uc740 \ud06c\uae30\ub97c \uc77d\uc744 \ub54c, \uc22b\uc790\uae4c\uc9c0 \uc601\uc5b4\ub85c \uc77d\uc5b4\ubc84\ub9ac\ub294 \uacbd\uc6b0\uac00 \ub300\ub2e4\uc218\uc774\ub2e4. \uc989, \uc704\uc758 $2 \\times 3$\ub97c \uc77d\uc73c\uba74, <em>two-by-three<\/em>\uc640 \uac19\uc774 \uc77d\uc5b4\uc57c \ub418\ub294 \uc2dd\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uba87 \uac00\uc9c0 \uc608\uc81c\ub97c \ud1b5\ud558\uc5ec \uc5f0\uc2b5\ud574\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>What&#8217;s the size of matrix $A$, defined as $A = \\begin{bmatrix} 3 \\\\ 1 \\\\ 2 \\end{bmatrix}$?<br>-&gt; Answer: It&#8217;s $3 \\times 1$ matrix.<\/li><li>What&#8217;s the size of matrix $B$, defined as $B = \\begin{bmatrix} 2 &amp; 7 &amp; 1 \\\\ 3 &amp; 3 &amp; -1 \\\\ 0.1 &amp; 4.5 &amp; 7 \\end{bmatrix}$?<br>-&gt; Answer: It&#8217;s $3 \\times 3$ matrix.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc88b\ub2e4! \uc774\uc81c \ud589\ub82c\uc758 \uae30\ubcf8 \uc5f0\uc0b0\uc744 \uc0b4\ud3b4\ubcfc \ucc28\ub840\uac00 \ub418\uc5c8\ub2e4.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%EA%B8%B0%EB%B3%B8_%EC%97%B0%EC%82%B0_%E2%80%93_%ED%96%89%EB%A0%AC%ED%95%A9_%ED%96%89%EB%A0%AC%EC%B0%A8_%ED%96%89%EB%A0%AC%EC%9D%98_%EC%8A%A4%EC%B9%BC%EB%9D%BC%EA%B3%B1_%ED%96%89%EB%A0%AC%EA%B3%B1\"><\/span>\ud589\ub82c\uc758 \uae30\ubcf8 \uc5f0\uc0b0 &#8211; \ud589\ub82c\ud569, \ud589\ub82c\ucc28, \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1, \ud589\ub82c\uacf1<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc77c\ubc18\uc801\uc778 \uc2e4\uc218 \uccb4\uacc4\uc5d0\uc11c\uc758 \uc0ac\uce59 \uc5f0\uc0b0\uc744 \uc0dd\uac01\ud574\ubcf4\uba74, \uc6b0\ub9ac\ub294 \ud06c\uac8c \uae30\ubcf8\uc801\uc73c\ub85c\ub294 \ub367\uc148, \ube84\uc148, \uacf1\uc148, \ub098\ub217\uc148\uc758 4\uc5f0\uc0b0\uc744 \uac00\uc9c0\uace0 \ucd08\ub4f1\ud559\uad50 \ub54c\ubd80\ud130 \ub180\uace4(\ud639\uc740 \uace0\ud1b5\ubc1b\uace4) \ud588\ub2e4. \ud589\ub82c\uc758 \uacbd\uc6b0\ub3c4 \uc774\ub4e4 \uae30\ubcf8\uc801\uc778 \uc0ac\uce59 \uc5f0\uc0b0\uc774\ub098 \ub2e4\ub984\uc5c6\ub294 4\uac00\uc9c0 \uc5f0\uc0b0\uc774 \uc815\uc758\uac00 \ub418\ub294\ub370, \uc2e4\uc218 \uccb4\uacc4\uc640\ub294 \uc57d\uac04 \ub2e4\ub978 \uc810\uc774 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uc5d0\uc11c \uae30\ubcf8 \uc5f0\uc0b0\uc774\ub780 \ud589\ub82c\ud569, \ud589\ub82c\ucc28 \uc5f0\uc0b0\uacfc \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1, \ud589\ub82c\uacf1\uc744 \uc77c\uceeb\ub294 \uc6a9\uc5b4\uc774\ub2e4. \ud569\uacfc \ucc28 \uc5f0\uc0b0\uc740 \uae30\ubcf8\uc801\uc73c\ub85c \uc2e4\uc218\uc758 \ub367\uc148, \ube84\uc148\uacfc \ube44\uc2b7\ud558\uace0, \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1\uc758 \uacbd\uc6b0\ub294 \uacf1\uc148\uacfc \ube44\uc2b7\ud558\uc9c0\ub9cc \ud589\ub82c\uacf1\uc758 \uacbd\uc6b0\ub294 \uc644\uc804\ud788 \ub2e4\ub974\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%ED%95%A9\"><\/span>\ud589\ub82c\ud569<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c\ud569(\u884c\u5217\u5408, Matrix Addition)<\/strong>\uc774\ub780 \uc2e4\uc218 \uc5f0\uc0b0\uc73c\ub85c \uce58\uba74 \ub367\uc148\uc5d0 \ub300\uc751\ub418\ub294 \ud589\ub82c\uc5d0\uc11c\uc758 \uc5f0\uc0b0\uc73c\ub85c, <strong>\ud06c\uae30\uac00 \uac19\uc740 \ub450 \ud589\ub82c<\/strong>\uc758 \uac01 \uc131\ubd84\uc744 \ud569\ud55c \uc131\ubd84\uc744 \uac00\uc9c0\ub294 \uc0c8\ub85c\uc6b4 \ud589\ub82c\uc744 \uc5bb\uc5b4\ub0b4\ub294 \uc5f0\uc0b0\uc774\ub77c\uace0 \ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\ub97c\ud14c\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 $2 \\times 3$ \ud589\ub82c 2\uac1c, \ud589\ub82c $A$\uc640 \ud589\ub82c $B$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub418\uc5b4 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; 3 &amp; -2 \\\\ 5 &amp; -10 &amp; 7 \\end{bmatrix}$<\/p><p>$B = \\begin{bmatrix} 2 &amp; -5 &amp; 8 \\\\ -1 &amp; 3 &amp; 11 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ub54c, \ud589\ub82c $A$\uc640 \ud589\ub82c $B$\ub97c \ud569\ud55c \ud589\ub82c $C$\ub97c \ud589\ub82c $A$, \ud589\ub82c $B$\uc758 \ud589\ub82c\ud569\uc774\ub77c \ud558\uace0, \uc774\ub294 \ub450 \ud589\ub82c\uc758 \uac01 \uc131\ubd84\ub4e4\uc758 \ud569\uc744 \uc131\ubd84\uc73c\ub85c \uac00\uc9c0\ub294 \ud589\ub82c\uc774 \ub41c\ub2e4. \uc989,<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$C = \\begin{bmatrix} 3 &amp; -2 &amp; 6 \\\\ 4 &amp; -7 &amp; 18 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc8fc\uc758\ud574\uc57c \ud560 \uac83\uc740, \ud589\ub82c\ud569\uc740 \uc11c\ub85c \ud06c\uae30\uac00 \ub2e4\ub978 \ud589\ub82c \uc0ac\uc774\uc5d0\ub294 \uc815\uc758\ub418\uc9c0 \uc54a\ub294 \uc5f0\uc0b0\uc774\ub77c\ub294 \uac83\uc774\ub2e4. \uc608\ucee8\ub300, $2 \\times 3$ \ud589\ub82c\uacfc $3 \\times 3$ \ud589\ub82c\uc740 \ud589\ub82c\ud569\uc774 \uc815\uc758\ub418\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2f9\uc5f0\ud558\uac8c\ub3c4, \ud589\ub82c\ud569\uc5d0\uc11c\ub294 \uad50\ud658 \ubc95\uce59\uc774 \uc131\ub9bd\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uba87 \uac00\uc9c0 \uc608\uc81c\ub97c \ud1b5\ud558\uc5ec \ubcf5\uc2b5\ud574\ubcf4\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>let $A = \\begin{bmatrix} 1 &amp; 2 \\\\ 3 &amp; 4 \\end{bmatrix}$ and $B = \\begin{bmatrix} -1 &amp; 0 \\\\ 0 &amp; 1 \\end{bmatrix}$, what matrix must be equal to $A + B$?<br>-&gt; Answer: $A + B = \\begin{bmatrix} 0 &amp; 2 \\\\ 3 &amp; 5 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} -1 &amp; 0 &amp; 6 \\\\ 2 &amp; 3 &amp; 5 \\end{bmatrix}$ and $B = \\begin{bmatrix} 3 &amp; 3 &amp; 7 \\\\ -1 &amp; 0 &amp; 0 \\end{bmatrix}$, what matrix must be equal to $A + B$?<br>-&gt; Answer: $A + B = \\begin{bmatrix} 2 &amp; 3 &amp; 13 \\\\ 1 &amp; 3 &amp; 5 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} -1 \\\\ 0 \\end{bmatrix}$ and $B = \\begin{bmatrix} 1 &amp; 2 \\end{bmatrix}$, what matrix must be equal to $A + B$?<br>-&gt; Answer: It&#8217;s not defined.<\/li><\/ol>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%B0%A8\"><\/span>\ud589\ub82c\ucc28<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c\ucc28(\u884c\u5217\u5dee, Matrix Subtraction)<\/strong>\uc774\ub780 \uc2e4\uc218 \uc5f0\uc0b0\uc73c\ub85c \uce58\uba74 \ube84\uc148\uc5d0 \ub300\uc751\ub418\ub294 \ud589\ub82c\uc5d0\uc11c\uc758 \uc5f0\uc0b0\uc73c\ub85c, <strong>\ud06c\uae30\uac00 \uac19\uc740 \ub450 \ud589\ub82c<\/strong>\uc758 \uac01 \uc131\ubd84\ub4e4\uc758 \ucc28\ub85c \uc5bb\uc5b4\uc9c0\ub294 \uc131\ubd84\uc744 \uac00\uc9c0\ub294 \uc0c8\ub85c\uc6b4 \ud589\ub82c\uc744 \uc5bb\uc5b4\ub0b4\ub294 \uc5f0\uc0b0\uc774\ub77c\uace0 \ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\ub97c\ud14c\uba74 \uc55e\uc11c \uc0b4\ud3b4\ubcf8 \ub450 \ud589\ub82c $A$, $B$\ub97c \uc0dd\uac01\ud574\ubcf4\uba74, \uc989 \ub2e4\uc74c\uc758 \ub450 \ud589\ub82c\uc5d0 \ub300\ud574\uc11c,<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; 3 &amp; -2 \\\\ 5 &amp; -10 &amp; 7 \\end{bmatrix}$<\/p><p>$B = \\begin{bmatrix} 2 &amp; -5 &amp; 8 \\\\ -1 &amp; 3 &amp; 11 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\ud589\ub82c $A$\uc5d0\uc11c \ud589\ub82c $B$\ub97c \ube80 \ud589\ub82c $D$\ub97c \ud589\ub82c $A$\uc5d0\uc11c \ud589\ub82c $B$\uc758 \ud589\ub82c\ucc28\ub77c \ud558\uace0, \uc774\ub294 \ud589\ub82c $A$\uc758 \uc131\ubd84\uc5d0\uc11c \ud589\ub82c $B$\uc758 \uc131\ubd84\uc744 \ube80 \uc131\ubd84\ub4e4\ub85c \uad6c\uc131\ub41c \ud589\ub82c\uc774 \ub41c\ub2e4. \uc989,<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$D = \\begin{bmatrix} -1 &amp; -8 &amp; -10 \\\\ 6 &amp; -13 &amp; -4 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc5ed\uc2dc \uc8fc\uc758\ud574\uc57c \ud560 \uac83\uc740, \ud589\ub82c\ucc28 \uc5ed\uc2dc\ub3c4 \uc11c\ub85c \ud06c\uae30\uac00 \ub2e4\ub978 \ud589\ub82c \uc0ac\uc774\uc5d0\uc11c\ub294 \uc815\uc758\ub418\uc9c0 \uc54a\ub294 \uc5f0\uc0b0\uc774\ub77c\ub294 \uac83\uc774\ub2e4. $2 \\times 3$ \ud589\ub82c\uacfc $3 \\times 3$ \ud589\ub82c\uc740 \uc11c\ub85c \uac04\uc5d0 \ud589\ub82c\ucc28\uac00 \uc815\uc758\ub418\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2f9\uc5f0\ud788 \ud589\ub82c\ucc28\uc5d0\uc11c\ub294 \uad50\ud658 \ubc95\uce59\uc774 \uc131\ub9bd\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc608\uc81c\ub97c \ud1b5\ud574 \ubcf5\uc2b5\ud574\ubcf4\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>let $A = \\begin{bmatrix} 1 &amp; 2 \\\\ 3 &amp; 4 \\end{bmatrix}$ and $B = \\begin{bmatrix} -1 &amp; 0 \\\\ 0 &amp; 1 \\end{bmatrix}$, what matrix must be equal to $A &#8211; B$?<br>-&gt; Answer: $A &#8211; B = \\begin{bmatrix} 2 &amp; 2 \\\\ 3 &amp; 3 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} -1 &amp; 0 &amp; 6 \\\\ 2 &amp; 3 &amp; 5 \\end{bmatrix}$ and $B = \\begin{bmatrix} 3 &amp; 3 &amp; 7 \\\\ -1 &amp; 0 &amp; 0 \\end{bmatrix}$, what matrix must be equal to $A &#8211; B$?<br>-&gt; Answer: $A &#8211; B = \\begin{bmatrix} -4 &amp; -3 &amp; -1 \\\\ 3 &amp; 3 &amp; 5 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} -1 \\\\ 0 \\end{bmatrix}$ and $B = \\begin{bmatrix} 1 &amp; 2 \\end{bmatrix}$, what matrix must be equal to $A &#8211; B$?<br>-&gt; Answer: It&#8217;s not defined.<\/li><\/ol>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EC%9D%98_%EC%8A%A4%EC%B9%BC%EB%9D%BC%EA%B3%B1\"><\/span>\ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1(Scalar Multiplication of Matrix)<\/strong>\uc774\ub780, \uc2e4\uc218 \uc5f0\uc0b0\uc73c\ub85c \uce58\uc790\uba74 \uacf1\uc148\uacfc \ube44\uc2b7\ud558\uc9c0\ub9cc \uc57d\uac04 \ub2e4\ub978 \uc5f0\uc0b0\uc73c\ub85c, \uc5b4\ub5a4 \ud589\ub82c\uc758 \uac01 \uc131\ubd84\uc744 \uacf1\ud574\uc9c0\ub294 \uc2e4\uc218\ub9cc\ud07c \ubc30(\u500d)\ud558\ub294 \ud589\ub82c \uc5f0\uc0b0\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\ub97c\ud14c\uba74 \uc5b4\ub5a4 \ud589\ub82c $E$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub418\uc5b4 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$E = \\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ub54c, \uc2e4\uc218 3\uc744 \uc774 \ud589\ub82c\uc5d0 \uc2a4\uce7c\ub77c\uacf1\ud574\ubc84\ub9ac\uba74, \uc774 \uacb0\uacfc\ub85c \uc5bb\uc5b4\uc9c4 \ud589\ub82c\uc740 $3 \\times \\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix}$\ub098 $\\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix} \\times 3$ \ub610\ub294 $3 \\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix}$ \ub610\ub294, $3E$\ub85c \uc4f8 \uc218 \uc788\uc73c\uba70, \uadf8 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$3E = \\begin{bmatrix} 3 &amp; -6 \\\\ 9 &amp; 0 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud55c \ud3b8, \ubcf4\ud1b5 \uc808\ub313\uac12\uc774 0\uacfc 1 \uc0ac\uc774\uc778, \ubd84\uc218\ub85c \ud45c\ud604\ub420 \uc218 \uc788\ub294 \uc2e4\uc218\ub97c \uc2a4\uce7c\ub77c\uacf1\ud558\ub294 \uacbd\uc6b0, \uc774\ub4e4\uc744 \ub098\ub217\uc148 \uc5f0\uc0b0\uc790\ub97c \uc774\uc6a9\ud558\uc5ec \ud45c\ud604\ud558\uae30\ub3c4 \ud55c\ub2e4. \uc608\ucee8\ub300, ${1 \\over 4} \\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix}$\ub97c, $\\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix} \/ 4$\uc640 \uac19\uc740 \uc2dd\uc73c\ub85c \ud45c\ud604\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1\uc758 \uacb0\uacfc\ub294 \ud589\ub82c\uc758 \ud06c\uae30\uc5d0 \ubb34\uad00\ud558\ub2e4. \ud558\uc9c0\ub9cc \uadf8 \uacb0\uacfc\ub294 \uc2a4\uce7c\ub77c\uacf1 \uc774\uc804\uc758 \ud589\ub82c\uacfc \uac19\ub2e4\ub294 \uc810\uc5d0 \uc8fc\uc758\ud558\uc790. \uc774\ub97c\ud14c\uba74 $0 \\times \\begin{bmatrix} 1 &amp; -2 \\\\ 3 &amp; 0 \\end{bmatrix}$\ub294 \uc2e4\uc218 0\uc774 \uc544\ub2c8\uace0, \ubaa8\ub4e0 \uc131\ubd84\uc774 0\uc778 $2 \\times 2$ \ud589\ub82c\uc778 $\\begin{bmatrix} 0 &amp; 0 \\\\ 0 &amp; 0 \\end{bmatrix}$\uac00 \ub41c\ub2e4\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uba87 \uac00\uc9c0 \uc608\uc81c\ub85c\uc368 \ubcf5\uc2b5\ud574\ubcf4\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>let $A = \\begin{bmatrix} -1 &amp; 3 \\end{bmatrix}$, what matrix must be equal to $-2A$?<br>-&gt; Answer: $-2A = \\begin{bmatrix} 2 &amp; -6 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} 2 &amp; 5 &amp; 0 \\\\ -1 &amp; 4 &amp; 3 \\end{bmatrix}$, what matrix must be equal to $A\/3$?<br>-&gt; Answer $A\/3 = \\begin{bmatrix} {2 \\over 3} &amp; {5 \\over 3} &amp; 0 \\\\ {-1 \\over 3} &amp; {4 \\over 3} &amp; 1 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} 3 &amp; 3 &amp; -1 \\\\ 2 &amp; 4 &amp; 7 \\\\ 0 &amp; 12 &amp; 3 \\end{bmatrix}$, what matrix must be equal to $0 \\times A$?<br>-&gt; Answer $0 \\times A = \\begin{bmatrix} 0 &amp; 0 &amp; 0 \\\\ 0 &amp; 0 &amp; 0 \\\\ 0 &amp; 0 &amp; 0 \\end{bmatrix}$<\/li><\/ol>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%ED%96%89%EB%A0%AC%EA%B3%B1\"><\/span>\ud589\ub82c\uacf1<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ud589\ub82c\uacf1(\u884c\u5217\uacf1, Matrix Multiplication)<\/strong>\uc740 \uc880 \ud2b9\uc774\ud55c \ud589\ub82c \uc5f0\uc0b0\uc73c\ub85c, \ub300\uc751\ub418\ub294 \uc2e4\uc218 \uc5f0\uc0b0\uc744 \ucc3e\uc544\ubcf4\uae30\ub294 \ud798\ub4e4\ub2e4. \ud589\ub82c\uacf1\uc758 \uacbd\uc6b0\ub294 \uadf8 \uc5f0\uc0b0\uc758 \uacb0\uacfc\ub85c \ud589\ub82c\uc774 \uc5bb\uc5b4\uc9c0\ub294\ub370, \ud589\ub82c\uacf1\uc774 \uc815\uc758\ub418\ub294 \ud589\ub82c\uc758 \ud06c\uae30\ub294 \uc55e\uc11c \ub2e4\ub8e8\uc5c8\ub358 \ud589\ub82c\ud569, \ud589\ub82c\ucc28, \ud589\ub82c\uc758 \uc2a4\uce7c\ub77c\uacf1\uacfc\ub294 \ub2e4\uc18c \ub2e4\ub974\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub450 \ud589\ub82c\uc758 \ud589\ub82c\uacf1(Matrix Product)\uc740 \uc804\uc790(\u524d\u8005) \ud589\ub82c\uc758 \uc5f4 \uac1c\uc218\uc640 \ud6c4\uc790(\u5f8c\u8005) \ud589\ub82c\uc758 \ud589\uc758 \uac1c\uc218\uac00 \ub3d9\uc77c\ud55c \uacbd\uc6b0\uc5d0\ub9cc \uc815\uc758\ub418\uace0, \uadf8 \uacb0\uacfc\ub85c \ub098\uc624\ub294 \ud589\ub82c\uc740 \uc804\uc790 \ud589\ub82c\uc758 \ud589 \uac1c\uc218\uc640 \ub3d9\uc77c\ud55c \uac1c\uc218\uc758 \ud589\uc744 \uac00\uc9c0\uace0, \ud6c4\uc790 \ud589\ub82c\uc758 \uc5f4 \uac1c\uc218\uc640 \ub3d9\uc77c\ud55c \uac1c\uc218\uc758 \uc5f4\uc744 \uac00\uc9c4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uacf1\uc740 \uadf8 \ud589\uacfc \uc5f4\uc5d0 \ud574\ub2f9\ud558\ub294 \uc804\uc790 \ud589\ub82c\uc758 \ud589\uacfc \ud6c4\uc790 \ud589\ub82c\uc758 \uc5f4\uc758 \uac01 \uc131\ubd84\ub4e4\uc5d0 \ub300\ud558\uc5ec, \uc774\ub4e4\uc758 \uacf1\ud569\uc73c\ub85c \uad6c\uc131\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc218\ud559\uc801\uc778 \uc815\uc758\ub85c\uc368 \uc218\uc2dd\uc744 \uc774\uc6a9\ud558\uc5ec \uc704 \ub450 \uc0ac\uc2e4\uc744 \ud45c\ud604\ud558\uc5ec \ubcf4\uaca0\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$m \\times r$ \ud589\ub82c\uc778 \ud589\ub82c $A$\uc640 $r \\times n$ \ud589\ub82c\uc778 \ud589\ub82c $B$\uac00 \uc788\ub2e4\uba74, \uadf8 \ud589\ub82c\uacf1 $AB$\ub294 $m \\times n$ \ud589\ub82c\uc774\ub2e4.<\/p><\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ub450 \ud589\ub82c $A$, $B$\uac00 $A = \\begin{bmatrix} a_{11} &amp; a_{12} &amp; &#8230; &amp; a_{1r} \\\\ a_{21} &amp; a_{22} &amp; &#8230; &amp; a_{2r} \\\\ &#8230; &amp; &#8230; &amp; &#8230; &amp; &#8230; \\\\ a_{m1} &amp; a_{m2} &amp; &#8230; &amp; a_{mr} \\end{bmatrix}$, $B = \\begin{bmatrix} b_{11} &amp; b_{12} &amp; &#8230; &amp; b_{1n} \\\\ b_{21} &amp; b_{22} &amp; &#8230; &amp; b_{2n} \\\\ &#8230; &amp; &#8230; &amp; &#8230; &amp; &#8230; \\\\ b_{r1} &amp; b_{r2} &amp; &#8230; &amp; b_{rn} \\end{bmatrix}$\ub85c \uc815\uc758\ub41c\ub2e4\uba74, <\/p><p>\ud589\ub82c\uacf1 $C = AB$\ub294 \ub2e4\uc74c\uc758 $m \\times n$ \ud589\ub82c\ub85c \uc815\uc758\ub41c\ub2e4.<\/p><p>$C = \\begin{bmatrix} c_{11} &amp; c_{12} &amp; &#8230; &amp; c_{1n} \\\\ c_{21} &amp; c_{22} &amp; &#8230; &amp; c_{2n} \\\\ &#8230; &amp; &#8230; &amp; &#8230; &amp; &#8230; \\\\ c_{m1} &amp; c_{m2} &amp; &#8230; &amp; c_{mn} \\end{bmatrix}$<\/p><p> \uc774 \ub54c, $i = 1, 2, &#8230;, m$, $j = 1, 2, &#8230; , n$\uc5d0 \ub300\ud558\uc5ec, \ud589\ub82c $C$\uc758 \uac01 \uc131\ubd84\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub41c\ub2e4.<\/p><p>$c_{ij} = a_{i1} b_{ij} + a_{i2} b_{2j} + &#8230; + a_{ir} b_{rj} = \\sum_{k=1}^r {a_{ik} b_{kj}}$<\/p><p> \uace7, $C = \\begin{bmatrix} a_{11} b_{11} + &#8230; + a_{1r} b_{r1} &amp; a_{11} b_{12} + &#8230; + a_{1r} b_{r2} &amp; &#8230; &amp; a_{11} b_{1n} + &#8230; + a_{1r} b_{rn} \\\\ a_{21} b_{11} + &#8230; + a_{2r} b_{r1} &amp; a_{21} b_{22} + &#8230; + a_{2r} b_{r2} &amp; &#8230; &amp; a_{21} b_{1n} + &#8230; + a_{2r} b_{rn} \\\\ &#8230; &amp; &#8230; &amp; &#8230; &amp; &#8230; \\\\ a_{11} b_{11} + &#8230; + a_{1r} b_{r1} &amp; a_{m1} b_{12} + &#8230; + a_{mr} b_{r2} &amp; &#8230; &amp; a_{m1} b_{1n} + &#8230; + a_{mr} b_{rn} \\end{bmatrix}$\uc774\ub2e4.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\ub807\uac8c \ub9d0\ud558\uba74 \ub3c4\ub300\uccb4 \ubb34\uc2a8 \uc18c\ub9ac\uc778\uc9c0 \uc54c\uae30\uac00 \uc5b4\ub824\uc6b0\ub2c8, \uc608\uc2dc\ub97c \ud1b5\ud574\uc11c \uc124\uba85\ud558\uae30\ub85c \ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc608\ucee8\ub300 \ub2e4\uc74c\uacfc \uac19\uc740 \ub450 $2 \\times 2$ \ud589\ub82c $A$, $B$\uac00 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; -1 \\\\ 2 &amp; 3 \\\\ 3 &amp; 6 \\end{bmatrix}$<\/p><p>$B = \\begin{bmatrix} 4 &amp; -2 &amp; 1 \\\\ 5 &amp; 0 &amp; 2 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ub54c, \ud589\ub82c\uacf1 $AB$\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4. \uc27d\uac8c \uc0dd\uac01\ud558\ub824\uba74, \ud589\ub82c\uacf1\uc758 $i$\ud589 $j$\uc5f4 \uc131\ubd84\uc740 \uc804\uc790 \ud589\ub82c\uc758 $i$\ubc88\uc9f8 \ud589\uacfc \ud6c4\uc790 \ud589\ub82c\uc758 $j$\ubc88\uc9f8 \uc5f4\uc758 \ubca1\ud130 \uc2a4\uce7c\ub77c\uacf1\uacfc \ube44\uc2b7\ud558\ub2e4\uace0 \uc0dd\uac01\ud560 \uc218 \uc788\ub2e4. (\uace0\ub4f1\ud559\uad50 \uae30\ud558\uc640 \ubca1\ud130\uc5d0 \ub098\uc624\ub294 \uadf8 \ubca1\ud130\uc758 &#8216;\ub0b4\uc801&#8217; \ub9d0\uc774\ub2e4)<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$AB = \\begin{bmatrix} 1 \\times 4 + (-1) \\times 5 &amp; 1 \\times (-2) + (-1) \\times 0 &amp; 1 \\times 1 + -1 \\times 2 \\\\ 2 \\times 4 + 3 \\times 5 &amp; 2 \\times (-2) + 3 \\times 0 &amp; 2 \\times 1 + 3 \\times 2 \\\\ 3 \\times 4 + 6 \\times 5 &amp; 3 \\times (-2) + 6 \\times 0 &amp; 3 \\times 1 + 6 \\times 2 \\end{bmatrix} = \\begin{bmatrix} -1 &amp; -2 &amp; -1 \\\\ 27 &amp; -4 &amp; 8 \\\\ 42 &amp; -6 &amp; 15 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud589\ub82c\uacf1 \uc5f0\uc0b0\uc740 \uad50\ud658 \ubc95\uce59\uc774 \uc77c\ubc18\uc801\uc73c\ub85c \uc131\ub9bd\ud558\uc9c0 \uc54a\ub294\ub2e4<\/strong>. \uc774\ub294 \uc2e4\uc218\uc5d0\uc11c\uc758 \uacf1\uc148\uc740 \uad50\ud658 \ubc95\uce59\uc774 \uc131\ub9bd\ud588\ub358 \uac83\uacfc\ub294 \ub300\uc870\uc801\uc774\ub2e4. \uc65c \ud589\ub82c\uacf1\uc5d0\uc11c \uad50\ud658 \ubc95\uce59\uc774 \uc131\ub9bd\ud558\uc9c0 \uc54a\ub294\uc9c0\ub97c \uc704 \uc608\uc2dc\ub85c \ub4e0 \ud589\ub82c $A$\uc640 \ud589\ub82c $B$\uc758 \ud589\ub82c\uacf1 $AB$\uc5d0\uc11c \uc804\uc790 \ud589\ub82c\uacfc \ud6c4\uc790 \ud589\ub82c\uc744 \uad50\ud658\ud55c \ud589\ub82c\uacf1 $BA$\ub85c\uc368 \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$BA = \\begin{bmatrix} 4 \\times 1 + (-2) \\times 2 + 1 \\times 3 &amp; 4 \\times (-1) + (-2) \\times 3 + 1 \\times 6 \\\\ 5 \\times 1 + 0 \\times 2 + 2 \\times 3 &amp; 5 \\times (-1) + 0 \\times 3 + 2 \\times 6 \\end{bmatrix} = \\begin{bmatrix} 3 &amp; -4 \\\\ 11 &amp; 7 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \uacb0\uacfc\ub97c \uc55e\uc11c \uacc4\uc0b0\ud55c \ud589\ub82c\uacf1 $AB$\uc640 \ube44\uad50\ud574\ubcf4\uc790. \uc77c\ub2e8 \uadf8 \uacb0\uacfc \ud589\ub82c\uc758 \ud06c\uae30\ubd80\ud130\uac00 \ub2e4\ub974\ub2e4. \ud655\uc2e4\ud788, \uc77c\ubc18\uc801\uc73c\ub85c $AB = BA$\ub77c \ud560 \uc218 \uc5c6\uc73c\ub2c8, \ud589\ub82c\uacf1\uc5d0\uc11c\ub294 \uad50\ud658 \ubc95\uce59\uc774 \uc77c\ubc18\uc801\uc73c\ub85c \uc131\ub9bd\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uba87 \uac00\uc9c0 \uc608\uc81c\ub97c \ud1b5\ud558\uc5ec, \uc774\uc81c \ud589\ub82c\uacf1\uc744 \uacc4\uc0b0\ud558\ub294 \uc5f0\uc2b5\uc744 \ud574 \ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>let $A = \\begin{bmatrix} 1 &amp; 2 \\end{bmatrix}$ and $B = \\begin{bmatrix} 0 \\\\ 3 \\end{bmatrix}$, what matrix must be equal to $AB$? What about $BA$? Does Matrix Multiplication have commutative property, according to those results?<br>-&gt; Solution And Answer: $AB = \\begin{bmatrix} 1 \\times 0 + 2 \\times 3 \\end{bmatrix} = \\begin{bmatrix} 6 \\end{bmatrix}$, $BA = \\begin{bmatrix} 0 \\times 1 &amp; 0 \\times 2 \\\\ 3 \\times 1 &amp; 3 \\times 2 \\end{bmatrix} = \\begin{bmatrix} 0 &amp; 0 \\\\ 3 &amp; 6 \\end{bmatrix}$, Therefore Matrix Multiplication doesn&#8217;t have commutative property, according to those results.<\/li><li>let $A = \\begin{bmatrix} 2 &amp; 3 \\\\ -1 &amp; 2 \\end{bmatrix}$ and $B = \\begin{bmatrix} 0 &amp; 5 \\\\ 2 &amp; 7 \\end{bmatrix}$, what matrix must be equal to $AB$?<br>-&gt; Solution And Answer: $AB = \\begin{bmatrix} 2 \\times 0 + 3 \\times 2 &amp; 2 \\times 5 + 3 \\times 7 \\\\ (-1) \\times 0 + 2 \\times 2 &amp; (-1) \\times 5 + 2 \\times 7 \\end{bmatrix} = \\begin{bmatrix} 6 &amp; 31 \\\\ 4 &amp; 9 \\end{bmatrix}$<\/li><li>let $A = \\begin{bmatrix} 3 &amp; -2 &amp; 7 \\\\ 0 &amp; 0 &amp; -1 \\end{bmatrix}$ and $B = \\begin{bmatrix} 1 &amp; 0 \\end{bmatrix}$, what matrix must be equal to $BA$?<br>-&gt; Answer: It&#8217;s not defined.<\/li><\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EC%A0%95%EC%82%AC%EA%B0%81%ED%96%89%EB%A0%AC_%EC%98%81%ED%96%89%EB%A0%AC_%EB%8C%80%EA%B0%81%ED%96%89%EB%A0%AC_%EB%8B%A8%EC%9C%84%ED%96%89%EB%A0%AC_%EC%A0%84%EC%B9%98%ED%96%89%EB%A0%AC\"><\/span>\uc815\uc0ac\uac01\ud589\ub82c, \uc601\ud589\ub82c, \ub300\uac01\ud589\ub82c, \ub2e8\uc704\ud589\ub82c, \uc804\uce58\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud2b9\uc815\ud55c \uba87\uba87 \ud589\ub82c\uc758 \uacbd\uc6b0\ub294 \ud2b9\uc774\ud55c \uae30\ub2a5\uc744 \ud558\uae30 \ub54c\ubb38\uc5d0, \uc774\ub4e4\uc744 \ubd80\ub974\ub294 \uc774\ub984\uc774 \ubcc4\ub3c4\ub85c \uc874\uc7ac\ud55c\ub2e4. \uc815\uc0ac\uac01\ud589\ub82c, \uc601\ud589\ub82c, \ub300\uac01\ud589\ub82c, \ub2e8\uc704\ud589\ub82c, \uc804\uce58\ud589\ub82c \ub4f1\uc774 \uadf8 \ub300\ud45c \uc8fc\uc790\ub4e4\uc778\ub370, \ud558\ub098\uc529 \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EC%A0%95%EC%82%AC%EA%B0%81%ED%96%89%EB%A0%AC\"><\/span>\uc815\uc0ac\uac01\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\uc815\uc0ac\uac01\ud589\ub82c(\u6b63\u56db\u89d2\u884c\u5217)<\/strong>\uc774\ub780 \ud589\uacfc \uc5f4\uc758 \uac1c\uc218\uac00 \uac19\uc740 \ud589\ub82c\uc774\ub2e4. \uc9c1\uad00\uc801\uc73c\ub85c \ub9d0\ud558\uc790\uba74, \uc815\uc0ac\uac01\ud615 \ud615\ud0dc\ub85c \uc0dd\uae34 \ud589\ub82c\uc778 \uc148\uc774\ub2e4. \ub530\ub77c\uc11c \ub2e4\uc74c\uc758 \ud589\ub82c\ub4e4\uc740 \ubaa8\ub450 \uc815\uc0ac\uac01\ud589\ub82c\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} 1 \\end{bmatrix}$, $\\begin{bmatrix} 0 &amp; -1 \\\\ 2 &amp; 7 \\end{bmatrix}$, $\\begin{bmatrix} 3 &amp; 3 &amp; 8 \\\\ -1 &amp; 0 &amp; 6 \\\\ 4 &amp; -5 &amp; 9 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EC%98%81%ED%96%89%EB%A0%AC\"><\/span>\uc601\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\uc601\ud589\ub82c<\/strong>\uc774\ub780 \ubaa8\ub4e0 \uc131\ubd84\uc774 0\uc778 \ud589\ub82c\uc774\ub2e4. \uc989, \ub2e4\uc74c\uc758 \ud589\ub82c\ub4e4\uc740 \ubaa8\ub450 \uc601\ud589\ub82c\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} 0 \\end{bmatrix}$, $\\begin{bmatrix} 0 &amp; 0 \\end{bmatrix}$, $\\begin{bmatrix} 0 &amp; 0 \\\\ 0 &amp; 0 \\\\ 0 &amp; 0 \\end{bmatrix}$, $\\begin{bmatrix} 0 &amp; 0 &amp; 0 \\\\ 0 &amp; 0 &amp; 0 \\\\ 0 &amp; 0 &amp; 0 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ubcf4\ud1b5 \uc601\ud589\ub82c\uc740 \uc8fc\uc5b4\uc9c0\ub294 \ud589\ub82c\uacfc \ud06c\uae30\uac00 \uac19\uc740 \uac83\uc73c\ub85c \ubcf4\uace0, \uae30\ud638 $O$\ub85c \ud45c\uc2dc\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc601\ud589\ub82c\uc740 \ud589\ub82c\ud569\uacfc \ud589\ub82c\ucc28\uc5d0 \ub300\ud55c \ud56d\ub4f1\uc6d0\uc774\ub2e4. \uc989, \uc5b4\ub5a4 \uc784\uc758\uc758 \ud589\ub82c $A$\uc5d0 \ub300\ud558\uc5ec, \uc774\uc640 \ud06c\uae30\uac00 \uac19\uc740 \uc601\ud589\ub82c\uc744 \ud569\ud558\uac70\ub098 \ube7c\ub3c4 \uadf8 \uacb0\uacfc\ub294 \ud589\ub82c $A$\uc640 \ub3d9\uc77c\ud558\ub2e4. \uc989, $A + O = O + A = A$\uac00 \uc131\ub9bd\ud55c\ub2e4. \uc774 \ubd80\ubd84\uc740 \uc9c1\uad00\uc801\uc73c\ub85c \ubc1b\uc544\ub4e4\uc77c \uc218 \uc788\uc73c\ubbc0\ub85c, \ubcc4\ub3c4\uc758 \uc608\uc2dc\ub97c \ub4e4\uc9c0\ub294 \uc54a\uaca0\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EB%8C%80%EA%B0%81%ED%96%89%EB%A0%AC\"><\/span>\ub300\uac01\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ub300\uac01\ud589\ub82c<\/strong>\uc774\ub780 \uc815\uc0ac\uac01\ud589\ub82c \uc911\uc5d0\uc11c, \ud589\uacfc \uc5f4\uc758 \ubc88\ud638\uac00 \ub3d9\uc77c\ud55c \uc131\ubd84\uc744 \uc81c\ud55c \ub098\uba38\uc9c0 \ubaa8\ub4e0 \uc131\ubd84\uc774 0\uc778 \ud589\ub82c\uc774\ub2e4. \uc218\ud559\uc801\uc73c\ub85c\ub294, \uc5b4\ub5a4 \uc815\uc0ac\uac01\ud589\ub82c $A$\uc5d0 \ub300\ud558\uc5ec, \uadf8 &#8216;\ud589\uacfc \uc5f4\uc758 \ubc88\ud638\uac00 \ub3d9\uc77c\ud55c \uc131\ubd84&#8217;\uc778 \uc131\ubd84 $a_{i i}$\ub97c \uc81c\uc678\ud55c \ub098\uba38\uc9c0 \uc131\ubd84\uc774 \ubaa8\ub450 0\uc778 \ud589\ub82c\uc774\ub2e4. \ub2e4\uc74c\uc758 \ud589\ub82c\ub4e4\uc740 \ubaa8\ub450 \ub300\uac01\ud589\ub82c\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} 1 &amp; 0 &amp; 0 \\\\ 0 &amp; -3 &amp; 0 \\\\ 0 &amp; 0 &amp; 7 \\end{bmatrix}$, $\\begin{bmatrix} 1 &amp; 0 \\\\ 0 &amp; 1 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub300\uac01\ud589\ub82c\uc774 \uc544\ub2c8\ub354\ub77c\ub3c4, \uc815\uc0ac\uac01\ud589\ub82c\uc5d0\uc11c &#8216;\ud589\uacfc \uc5f4\uc758 \ubc88\ud638\uac00 \ub3d9\uc77c\ud55c \uc131\ubd84&#8217;\uc744 \uc77c\ubc18\uc801\uc73c\ub85c \ud589\ub82c\uc758 \ub300\uac01\uc131\ubd84\uc774\ub77c\uace0 \ud55c\ub2e4. \uc989, \ub300\uac01\ud589\ub82c\uc740 \ub300\uac01\uc131\ubd84\uc744 \uc81c\uc678\ud55c \ub098\uba38\uc9c0 \uc131\ubd84\ub4e4\uc774 \ubaa8\ub450 0\uc778 \uc815\uc0ac\uac01\ud589\ub82c\uc774\ub77c\uace0 \uc815\uc758\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EB%8B%A8%EC%9C%84%ED%96%89%EB%A0%AC\"><\/span>\ub2e8\uc704\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\ub2e8\uc704\ud589\ub82c<\/strong>\uc774\ub780 \ub300\uac01\ud589\ub82c \uc911\uc5d0\uc11c\ub3c4, \uadf8 \ub300\uac01\uc131\ubd84\uc774 \ubaa8\ub450 1\uc778 \ub300\uac01\ud589\ub82c\uc744 \ub9d0\ud55c\ub2e4. \uc989, \ub2e4\uc74c\uc758 \ud589\ub82c\ub4e4\uc740 \ubaa8\ub450 \ub2e8\uc704\ud589\ub82c\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} 1 \\end{bmatrix}$, $\\begin{bmatrix} 1 &amp; 0 \\\\ 0 &amp; 1 \\end{bmatrix}$, $\\begin{bmatrix} 1 &amp; 0 &amp; 0 \\\\ 0 &amp; 1 &amp; 0 \\\\ 0 &amp; 0 &amp; 1 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2e8\uc704\ud589\ub82c\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \uae30\ud638 $I$\ub85c \ud45c\uc2dc\ud558\uba70, \uadf8 \ud06c\uae30\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \uc8fc\uc5b4\uc9c4 \ud589\ub82c\uacfc \ud589\ub82c\uacf1\uc774 \uc131\ub9bd\ud558\ub3c4\ub85d \uc8fc\uc5b4\uc9c4\ub2e4\uace0 \uc0dd\uac01\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2e8\uc704\ud589\ub82c\uc740 \uc815\uc0ac\uac01\ud589\ub82c\uc758 \ud589\ub82c\uacf1\uc5d0 \ub300\ud55c \ud56d\ub4f1\uc6d0\uc774\ub2e4. \uc989, \uc5b4\ub5a4 \uc784\uc758\uc758 \uc815\uc0ac\uac01\ud589\ub82c $A$\uc758 \uc67c\ucabd\uc5d0 \ub2e8\uc704\ud589\ub82c\uc744 \uacf1\ud558\ub4e0, \uc624\ub978\ucabd\uc5d0 \ub2e8\uc704\ud589\ub82c\uc744 \uacf1\ud558\ub294, \uadf8 \uacb0\uacfc\ub294 \uc6d0 \ud589\ub82c $A$\uc640 \uac19\ub2e4. \uc989, $IA = AI = A$\uc774\ub2e4. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">  \ub2e8\uc704\ud589\ub82c\uc774 \uc815\uc0ac\uac01\ud589\ub82c\uc758 \ud589\ub82c\uacf1\uc5d0 \ub300\ud55c \ud56d\ub4f1\uc6d0\uc774 \ub9de\ub294\uc9c0 \ud55c \uac00\uc9c0 \uc608\uc2dc\ub85c\uc368 \ud655\uc778\ud574\ubcf4\uc790. \ud589\ub82c $A$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub41c\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; 2 &amp; 7 \\\\ 3 &amp; -1 &amp; 0 \\\\ 0 &amp; 1 &amp; 1 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc6b0\uc120 $IA$\ubd80\ud130 \uacc4\uc0b0\ud574\ubcf4\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$IA = \\begin{bmatrix} 1 &amp; 0 &amp; 0 \\\\ 0 &amp; 1 &amp; 0 \\\\ 0 &amp; 0 &amp; 1 \\end{bmatrix} \\begin{bmatrix} 1 &amp; 2 &amp; 7 \\\\ 3 &amp; -1 &amp; 0 \\\\ 0 &amp; 1 &amp; 1 \\end{bmatrix} = \\begin{bmatrix} 1 \\times 1 + 0 \\times 3 + 0 \\times 0 &amp; 1 \\times 2 + 0 \\times (-1) + 0 \\times 1 &amp; 1 \\times 0 + 0 \\times 0 + 0 \\times 1 \\\\ 0 \\times 1 + 1 \\times 3 + 0 \\times 0 &amp; 0 \\times 2 + 1 \\times (-1) + 0 \\times 1 &amp; 0 \\times 7 + 1 \\times 0 + 0 \\times 1 \\\\ 0 \\times 1 + 0 \\times 3 + 1 \\times 0 &amp; 0 \\times 2 + 0 \\times (-1) + 1 \\times 1 &amp; 0 \\times 7 + 0 \\times 0 + 1 \\times 1 \\end{bmatrix} = \\begin{bmatrix} 1 &amp; 2 &amp; 7 \\\\ 3 &amp; -1 &amp; 0 \\\\ 0 &amp; 1 &amp; 1 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2e4\uc74c\uc73c\ub85c $AI$\ub97c \uacc4\uc0b0\ud574\ubcf4\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$AI = \\begin{bmatrix} 1 &amp; 2 &amp; 7 \\\\ 3 &amp; -1 &amp; 0 \\\\ 0 &amp; 1 &amp; 1 \\end{bmatrix} \\begin{bmatrix} 1 &amp; 0 &amp; 0 \\\\ 0 &amp; 1 &amp; 0 \\\\ 0 &amp; 0 &amp; 1 \\end{bmatrix} = \\begin{bmatrix} 1 \\times 1 + 2 \\times 0 + 7 \\times 0 &amp; 1 \\times 0 + 2 \\times 1 + 7 \\times 0 &amp; 1 \\times 0 + 2 \\times 0 + 7 \\times 1 \\\\ 3 \\times 1 + (-1) \\times 0 + 0 \\times 0 &amp; 3 \\times 0 + (-1) \\times 1 + 0 \\times 0 &amp; 3 \\times 0 + (-1) \\times 0 + 0 \\times 1 \\\\ 0 \\times 1 + 1 \\times 0 + 0 \\times 0 &amp; 0 \\times 0 + 1 \\times 1 + 1 \\times 0 &amp; 0 \\times 0 + 1 \\times 0 + 1 \\times 1 \\end{bmatrix} = \\begin{bmatrix} 1 &amp; 2 &amp; 7 \\\\ 3 &amp; -1 &amp; 0 \\\\ 0 &amp; 1 &amp; 1 \\end{bmatrix}$ <\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc704\uc758 \uc608\uc81c\ub85c, $IA = AI = A$\uc784\uc744 \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EC%A0%84%EC%B9%98%ED%96%89%EB%A0%AC\"><\/span>\uc804\uce58\ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"> <strong>\uc804\uce58\ud589\ub82c<\/strong>\uc774\ub780, \uc8fc\uc5b4\uc9c4 \ud589\ub82c\uc758 \uc131\ubd84\ub4e4\uc744 \uac01\uac01 \ud589\uacfc \uc5f4\uc744 \ubc14\uafb8\uc5b4\uc11c \ub9cc\ub4e4\uc5b4\ub0b8 \ud589\ub82c\uc774\ub2e4. \uc218\ud559\uc801\uc73c\ub85c\ub294, \uc5b4\ub5a4 \ud589\ub82c $A$\uac00 \uc788\uc744 \ub54c, \uc774 \ud589\ub82c\uc758 \uc6d0\uc18c $a_{ij}$\ub97c $b_{ji}$\uc5d0 \ub300\uc751\uc2dc\ucf1c \ub9cc\ub4e4\uc5b4\ub0b8 \ud589\ub82c $B$\ub97c \ud589\ub82c $A$\uc758 \uc804\uce58\ud589\ub82c\uc774\ub77c \ud558\uace0, \uae30\ud638\ub85c\ub294 $A^{T}$\ub85c \uc4f4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc9c1\uad00\uc801\uc73c\ub85c \uc774\uc57c\uae30\ud558\uc790\uba74, \uc804\uce58\ud589\ub82c\uc740 \uc5b4\ub5a4 \ud589\ub82c\uc744 \uc67c\ucabd \uc544\ub798\uc5d0\uc11c \uc624\ub978\ucabd \uc704\ub85c \ub4a4\uc9d1\uc740 \ud589\ub82c\uc774\ub77c\uace0 \uc0dd\uac01\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc608\uc2dc\ub97c \ud1b5\ud574 \uc0b4\ud3b4\ubcf4\uc790. \ud589\ub82c $A$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub418\uc5b4 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 &amp; 0 &amp; 7 \\\\ 2 &amp; 3 &amp; 6 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ub54c, \uc774 \ud589\ub82c $A$\uc758 \uc804\uce58\ud589\ub82c $A^{T}$\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A^{T} = \\begin{bmatrix} 1 &amp; 2 \\\\ 0 &amp; 3 \\\\ 7 &amp; 6 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EB%B2%A1%ED%84%B0\"><\/span>\ubca1\ud130<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\uc774 \ubd80\ubd84\uc5d0 \ub300\ud574\uc11c\ub294 \ub3c5\uc790 \uc5ec\ub7ec\ubd84\ub4e4\uc774 \ub300\ud55c\ubbfc\uad6d \uace0\ub4f1\ud559\uad50 \uad50\uc721 \uacfc\uc815 \uc0c1\uc758 &#8216;\uae30\ud558\uc640 \ubca1\ud130&#8217;\ub97c \ud559\uc2b5\ud558\uc5ec \uad00\ub828 \uc9c0\uc2dd\uc774 \uc788\ub2e4\ub294 \uc804\uc81c \ud558\uc5d0 \uc4f0\uc5ec\uc84c\uc74c\uc744 \uc54c\ub9bd\ub2c8\ub2e4.<\/p><\/blockquote>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EB%B2%A1%ED%84%B0%EC%99%80_%ED%96%89%EB%A0%AC\"><\/span>\ubca1\ud130\uc640 \ud589\ub82c<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> \uace0\ub4f1\ud559\uad50 &#8216;\uae30\ud558\uc640 \ubca1\ud130&#8217;\uc5d0\uc11c \uc6b0\ub9ac\uac00 \ubc30\uc6b4 \ubca1\ud130\ub294 \ud3c9\uba74 \ubca1\ud130\uc640 \uacf5\uac04 \ubca1\ud130\uac00 \uc788\uc5c8\ub2e4. \uacb0\uad6d\uc740 \ubc29\ud5a5\uacfc \ud06c\uae30\ub97c \uac00\uc9c0\ub294 \uc591\uc774\ub77c\uace0\ub3c4 \ud560 \uc218 \uc788\ub294 \uc774 \ubca1\ud130\ub294, \uc6b0\ub9ac\ub294 \uc5b4\ub5a4 \uc2dc\uc810\uc5d0\uc11c \uc885\uc810\uc73c\ub85c \ud5a5\ud558\ub294 \uc720\ud5a5\uc120\ubd84\uc73c\ub85c\uc368 \ubca1\ud130\ub97c \uae30\ud558\uc801\uc73c\ub85c \ub3c4\uc2dd\ud55c\ub2e4\ub294 \uac83\ub3c4 \ubc30\uc6e0\uace0, \uc9c1\uad50\uc88c\ud45c\uacc4\uc5d0\uc11c \uacf5\uac04, \ub610\ub294 \ud3c9\uba74\uc5d0\uc11c\uc758 \ubca1\ud130\uc758 \uc131\ubd84\ubc95\uc5d0 \ub300\ud558\uc5ec \ubc30\uc6e0\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc5ec\uae30\uc11c \ub2e4\ub8f0 \ub0b4\uc6a9\uc740 \ubca1\ud130\uc640 \ud589\ub82c \uc0ac\uc774\uc758 \uad00\uacc4\uc5d0 \uad00\ud55c \uac83\uc778\ub370, \uadf8 \uc774\uc804\uc5d0 \uc6b0\uc120 \ubca1\ud130\uc758 \uc131\ubd84\ubc95\uc744 \uba3c\uc800 \ubcf5\uc2b5\uc744 \uc880 \ud574 \ubcf4\ub3c4\ub85d \ud558\uc790. 2\ucc28\uc6d0 \ubca1\ud130\uc5d0 \ud574\ub2f9\ud558\ub294 \ud3c9\uba74 \ubca1\ud130\ub97c \uc608\ub85c \ub4e4\uc790.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/img1.daumcdn.net\/thumb\/R1280x0\/?scode=mtistory2&amp;fname=http%3A%2F%2Fcfile30.uf.tistory.com%2Fimage%2F2751B9435941EE340C7643\" alt=\"\"\/><figcaption>\ud3c9\uba74\ubca1\ud130\uc758 \uc131\ubd84\ubc95, \ucd9c\ucc98: <a href=\"https:\/\/suhak.tistory.com\/444\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/suhak.tistory.com\/444<\/a><\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc704\uc758 \uadf8\ub9bc\uc5d0\uc11c \ubca1\ud130 $A$\ub97c \uc8fc\ubaa9\ud558\uc790. \ud3c9\uba74 \uc9c1\uad50\uc88c\ud45c\uacc4\uc5d0\uc11c, \uc6b0\ub9ac\ub294 \ubca1\ud130 $A$\uc758 \uc2dc\uc810\uc744 \uc6d0\uc810\uc73c\ub85c \uc77c\uce58\uc2dc\ucf30\uc744 \ub54c, \uadf8 \uc885\uc810\uc778 \uc810 $A$\uc758 $x$\uc88c\ud45c\ub97c \ubca1\ud130 $A$\uc758 $x$\uc131\ubd84\uc774\ub77c \ud558\uace0, \uc810 $A$\uc758 $y$\uc88c\ud45c\ub97c \ubca1\ud130 $A$\uc758 $y$\uc131\ubd84\uc774\ub77c\uace0 \ud558\uba70, \ubaa8\ub4e0 \ud3c9\uba74 \ubca1\ud130\uc758 \uacbd\uc6b0\ub294 \ub450 \uac1c\uc758 \uc9c1\uad50 \uc88c\ud45c\ucd95 \uc131\ubd84\uc73c\ub85c\uc368 \ud45c\ud604\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc744 \ubc30\uc6e0\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub610\ud55c, \uc6b0\ub9ac\ub294 3\ucc28\uc6d0\uc5d0\uc11c \uacf5\uac04 \ubca1\ud130\uc758 \uacbd\uc6b0\ub294, $xyz$ \uc9c1\uad50 \uc88c\ud45c\uacc4\uc5d0\uc11c $x$\uc131\ubd84\uacfc $y$\uc131\ubd84, \uadf8\ub9ac\uace0 $z$ \uc131\ubd84\uc73c\ub85c\uc368 \ud45c\ud604\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\ub3c4 \ubc30\uc6e0\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud55c\ub370, \uc120\ud615 \ub300\uc218\ud559\uc5d0\uc11c\ub294 \ubca1\ud130\uc758 \uc815\uc758\ub97c 3\ucc28\uc6d0 \uc774\uc0c1\uc73c\ub85c \ud655\uc7a5\uc2dc\ucf1c\ubc84\ub9b0\ub2e4. \uc5b4\ub5bb\uac8c \uc774\uac83\uc774 \uac00\ub2a5\ud55c \uac83\uc77c\uae4c? \uc6b0\ub9ac\ub294 \uace0\ub4f1\ud559\uad50 \uad50\uc721 \uacfc\uc815\uc5d0\uc11c \uae30\ud558\uc801\uc73c\ub85c \ub300\uc751\ub420 \uc218 \uc788\ub294, \uc801\uc5b4\ub3c4 3\ucc28\uc6d0 \uacf5\uac04 \uc548\uc5d0\uc11c\uc758 \ubca1\ud130\uc5d0 \ub300\ud574\uc11c \ub2e4\ub8e8\uc5c8\uc9c0\ub9cc, \uc120\ud615 \ub300\uc218\ud559\uc5d0\uc11c\ub294 \ubca1\ud130\ub97c \ud589\ub82c\uc758 \uc77c\ubd80\ub85c \ubcf8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc120\ud615 \ub300\uc218\ud559\uc5d0\uc11c <strong>\ubca1\ud130\ub780 $1 \\times n$ \ud589\ub82c<\/strong>\uc744 \ub9d0\ud558\ub294 \uac83\uc774\ub2e4. \uc989, \ub2e4\uc74c\uc758 \ud589\ub82c\ub4e4\uc740 \ubaa8\ub450 \ubca1\ud130\uc774\ub2e4.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$\\begin{bmatrix} 1 \\\\ 2 \\end{bmatrix}$, $\\begin{bmatrix} 0 \\\\ 0 \\\\ -1 \\end{bmatrix}$, $\\begin{bmatrix} 0 \\\\ -1 \\\\ 4 \\\\ 5 \\\\ 7 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ud589\ub82c\uc774 \uc5b4\ub5bb\uac8c \uc6b0\ub9ac\uac00 \uae30\uc874\uc5d0 \uc54c\uace0 \uc788\ub294 \ubca1\ud130\uc640 \ub300\uc751\ub41c\ub2e4\ub294 \uac83\uc77c\uae4c? \uac04\ub2e8\ud558\ub2e4. \uc6b0\ub9ac\uac00 \ud754\ud788 \uc0dd\uac01\ud558\ub294 \ubca1\ud130\uc758 \uac01 \uc131\ubd84\ub4e4\uc774 \ud589\ub82c\uc758 \uac01 \ud589\uc758 \uc131\ubd84\ub4e4\uc5d0 \ub300\uc751\ub418\ub294 \uac83\uc774\ub2e4. \uc989, \uc774\ub97c\ud14c\uba74<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\uacf5\uac04 \ubca1\ud130 $A = (1, -1, 0) = \\begin{bmatrix} 1 \\\\ -1 \\\\ 0 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\uc778 \uc2dd\uc774\ub2e4. \uc774\uc640 \uac19\uc740 \ubc29\ubc95\uc73c\ub85c \uc0dd\uac01\ud558\uba74, \uc784\uc758\uc758 n\ucc28\uc6d0 \ubca1\ud130\uae4c\uc9c0 \uc0dd\uac01\ud574\ub0bc \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%EB%B2%A1%ED%84%B0%EC%9D%98_%EB%82%B4%EC%A0%81%EA%B3%BC_%ED%96%89%EB%A0%AC%EA%B3%B1\"><\/span>\ubca1\ud130\uc758 \ub0b4\uc801\uacfc \ud589\ub82c\uacf1<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc6b0\ub9ac\ub294 \uace0\ub4f1\ud559\uad50 \ub54c, \ud3c9\uba74 \ud639\uc740 \uacf5\uac04 \ubca1\ud130\uc758 \ub0b4\uc801, \uc989 \ubca1\ud130\uc758 \uc2a4\uce7c\ub77c\uacf1\uc5d0 \ub300\ud558\uc5ec \ubc30\uc6b4 \ubc14\uac00 \uc788\ub2e4. \uadf8 \ub54c \uc6b0\ub9ac\ub294 \ud3c9\uba74 \ubca1\ud130\uc758 \ub0b4\uc801\uacfc \uacf5\uac04 \ubca1\ud130\uc758 \ub0b4\uc801\uc740, \uac01 \ub300\uc751 \uc131\ubd84\ub4e4\uc758 \uacf1\ud569\uc73c\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc744 \ubc30\uc6e0\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ud589\ub82c\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub0b4\uc801\uc744 \uacc4\uc0b0\ud558\ub294 \uac83\ub3c4 \ubcc4\ubc18 \ub2e4\ub978 \uc77c\uc740 \uc544\ub2c8\ub2e4. \uc774\ubbf8 \uc6b0\ub9ac\uac00 \ud589\ub82c\uc744 \uc120\ud615 \ub300\uc218\ud559\uc801\uc73c\ub85c $1 \\times n$ \ud06c\uae30\uc758 \ubaa8\ub4e0 \ud589\ub82c\uc774\ub77c\uace0 \uc815\uc758\ud588\uc9c0\ub9cc, \uc6b0\ub9ac\uac00 \uae30\uc874\uc5d0 \uc54c\uace0 \uc788\ub358 \ud3c9\uba74, \uacf5\uac04 \ubca1\ud130\uc758 \ub0b4\uc801 \uacc4\uc0b0\ubc95\uacfc \uc720\uc0ac\ud55c \ud589\ub82c\uacf1\uc744 \uc0ac\uc6a9\ud558\uba74 \ube60\ub974\uac8c \ubca1\ud130\uc758 \ub0b4\uc801\uc744 \uacc4\uc0b0\ud574\ub0bc \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc784\uc758\uc758 \ub450 \ubca1\ud130\uc758 \ub0b4\uc801\uc774 \uc815\uc758\ub418\ub824\uba74, \uc6b0\uc120 \ub450 \ubca1\ud130\uc5d0 \ub300\uc751\ub418\ub294 \ud589\ub82c\uc758 \ud06c\uae30\ub294 \ub3d9\uc77c\ud574\uc57c \ud55c\ub2e4. (\uc989, \ub450 \ubca1\ud130\ub97c \ud589\ub82c\ub85c \ud45c\ud604\ud558\uc600\uc744 \ub54c, \uadf8 \ud589\ub82c\uc758 \ud06c\uae30\uac00 \ub3d9\uc77c\ud558\ub2e4\ub294 \ub9d0\uc774\ub2e4)<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ubca1\ud130 $A = \\begin{bmatrix} a_1 \\\\ a_2 \\\\ &#8230; \\\\ a_n \\end{bmatrix}$, \ubca1\ud130 $B = \\begin{bmatrix} b_1 \\\\ b_2 \\\\ &#8230; \\\\ b_n \\end{bmatrix}$\uc5d0 \ub300\ud558\uc5ec, \ubca1\ud130 $A$\uc640 \ubca1\ud130 $B$\uc758 \ub0b4\uc801 $A \\cdot B = det(A^{T}B)$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> <em>\ucc38\uace0: \uc704\uc758 \uc218\uc2dd\uc5d0\uc11c \uc0ac\uc6a9\ub41c det\ub294 \uc774 \ud589\ub82c\uc758 \ud589\ub82c\uc2dd\uc744 \uacc4\uc0b0\ud558\uaca0\ub2e4\ub294 \ud45c\uc2dc\uc778\ub370, \ud589\ub82c\uc2dd\uc740 \uc5ec\uae30\uc11c \ub2e4\ub8e8\uae30\uc5d0\ub294 \ub108\ubb34 \ubcf5\uc7a1\ud558\ub2e4. \ub3c5\uc790 \uc5ec\ub7ec\ubd84\ub4e4\uc774 \uc54c\uc544\uc11c Google\ub9c1\uc744 \ud558\uc154\uc57c\uaca0\uc9c0\ub9cc, \uadf8\ub798\ub3c4 \ucc38\uace0\ud560 \uc218 \uc788\uc744 \uc0ac\uc774\ud2b8 \uba87 \uad70\ub370\ub97c \ucca8\ubd80\ud574\ub454\ub2e4.<\/em><br>&#8211; <em><a href=\"https:\/\/mathbang.net\/570\" target=\"_blank\" rel=\"noreferrer noopener\" title=\"https:\/\/mathbang.net\/570\">\uc218\ud559\ubc29 &#8211; \uc5f0\ub9bd\uc77c\ucc28\ubc29\uc815\uc2dd\uc774 \ud574\ub97c \uac00\uc9c8 \uc870\uac74<\/a><\/em><br>&#8211; <em><a href=\"https:\/\/ratsgo.github.io\/linear%20algebra\/2017\/05\/21\/determinants\/\" target=\"_blank\" rel=\"noreferrer noopener\">ratsgo&#8217;s blog &#8211; \ud589\ub82c\uc2dd(determinant)<\/a><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc608\uc2dc\uc640 \ud568\uaed8 \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790. \uc774\ub97c\ud14c\uba74 \ub450 \ubca1\ud130 $A$, $B$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub418\uc5b4 \uc788\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 \\\\ 0 \\\\ -1 \\\\ 2 \\end{bmatrix}$<br>$B = \\begin{bmatrix} -1 \\\\ 2 \\\\ 3 \\\\ 0 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774 \ub54c, \uc704\uc5d0 \uc815\uc758\ub41c \ubc14\uc640 \uac19\uc774 \ub0b4\uc801\uc744 \uacc4\uc0b0\ud558\uba74,<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A \\cdot B = det(A^{T}B) = det(\\begin{bmatrix} 1 &amp; 0 &amp; -1 &amp; 2 \\end{bmatrix} \\begin{bmatrix} -1 \\\\ 2 \\\\ 3 \\\\ 0 \\end{bmatrix}) = det(\\begin{bmatrix} 1 \\times (-1) + 0 \\times 2 + (-1) \\times 3 + 2 \\times 0 \\end{bmatrix}) = det(\\begin{bmatrix} -5 \\end{bmatrix}) = 5$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc989, \uc2e4\uc9c8\uc801\uc73c\ub85c \uc6b0\ub9ac\uac00 \ud3c9\uba74, \ud639\uc740 \uacf5\uac04 \ubca1\ud130\uc5d0 \ub300\ud574 \ub0b4\uc801\uc744 \ud589\ud560 \uc801\uc758 \uc2dd\uacfc \uc720\uc0ac\ud558\ub2e4. \uc774 \ubc29\ubc95\uc73c\ub85c \ud3c9\uba74 \uacf5\uac04 \ubca1\ud130\uc5d0 \ub300\ud55c \ub0b4\uc801\uc744 \uacc4\uc0b0\ud574\uc11c, \ud569\ub9ac\uc801\uc778\uc9c0\ub97c \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uacf5\uac04 \ubca1\ud130 $A$, $B$\uac00 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ub41c\ub2e4\uace0 \ud558\uc790.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A = \\begin{bmatrix} 1 \\\\ 0 \\\\ 0 \\end{bmatrix}$<br>$B = \\begin{bmatrix} -1 \\\\ 3 \\\\ 4 \\end{bmatrix}$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc6b0\uc120 \uc6b0\ub9ac\uac00 \uc54c\uace0 \uc788\ub294 \uc77c\ubc18\uc801\uc778 \uacf5\uac04 \ubca1\ud130\uc758 \ub0b4\uc801\uc744 \ud65c\uc6a9\ud558\uba74 $A = (1, 0, 0)$, $B = (-1, 3, 4)$\uc774\ubbc0\ub85c $A \\cdot B = 1 \\times (-1) + 0 \\times 3 + 0 \\times 4 = -1$.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \ub2e4\uc74c\uc73c\ub85c \ud589\ub82c\ub85c \uc815\uc758\ub41c \ub0b4\uc801\uc744 \uc0ac\uc6a9\ud558\uba74<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>$A \\cdot B = det(A^{T}B) = det(\\begin{bmatrix} 1 &amp; 0 &amp; 0 \\end{bmatrix} \\begin{bmatrix} -1 \\\\ 3 \\\\ 4 \\end{bmatrix}) = det(\\begin{bmatrix} 1 \\times (-1) + 0 \\times 3 + 0 \\times 4 \\end{bmatrix}) = det(\\begin{bmatrix} -1 \\end{bmatrix}) = -1$<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc989, \ub450 \ubc29\ubc95\uc73c\ub85c\uc758 \uacc4\uc0b0 \uacb0\uacfc\uac00 \uc77c\uce58\ud558\uae30 \ub54c\ubb38\uc5d0, \ud589\ub82c\ub85c \uc704\uc640 \uac19\uc774 \uc815\uc758\ub41c \ubca1\ud130\uc758 \ub0b4\uc801\uc740 \ub0a9\ub4dd\ud560 \ub9cc \ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \uc774\uc0c1\uc73c\ub85c \ud574\uc11c \uc55e\uc73c\ub85c \uc7a0\uae50\uc740 \ud65c\uc6a9\ud560 \uc218 \uc788\uc744 \ud589\ub82c\uacfc \ubca1\ud130\uc5d0 \ub300\ud55c \uae30\ubcf8 \uac1c\ub150\uacfc \uac01\uc885 \uc5f0\uc0b0, \uc0c1\uad00\uad00\uacc4 \ub4f1\uc744 \uc815\ub9ac\ud588\ub2e4. \ub2e4\uc74c Mathematical Basis\uc5d0\uc11c\ub294 \ubb34\uc5c7\uc744 \uc5f0\uc7ac\ud560\uc9c0\ub294 \ubaa8\ub974\uaca0\uc9c0\ub9cc, \uc5b4\uca0c\uac70\ub098 \ub2e4\uc74c\uc5d0 \ub610 \uba38\uc2e0\ub7ec\ub2dd\uc774\ub098 \ub370\uc774\ud130\uacfc\ud559 \ucabd\uc744 \uacf5\ubd80\ud558\ub2e4\uac00 \uc218\ud559\uc801 \ubca0\uc774\uc2a4\uac00 \ud544\uc694\ud574\uc9c0\ub294 \uc21c\uac04\uc774 \uc624\uba74, \ud55c \ubc88 \ub354 \uc815\ub9ac\ud558\uac8c \ub420 \uac83 \uac19\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8216;\ub370\uc774\ud130\uacfc\ud559 \ud0d0\uad6c\ub178\ud2b8&#8217; \uc2dc\ub9ac\uc988\ub294 \uce74\ud398\uc9c0\uae30 \ucee4\ud53c\uc0ac\uc720\uac00 7\ub144\ub3d9\uc548 \uc544\ub9c8\ucd94\uc5b4 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \ucde8\ubbf8\uc0bc\uc544 \uc990\uae30\ub2e4\uac00, \ubd80\ub7b4\ubd80\ub7b4 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