{"description":"2\u6b21\u6b63\u65b9\u884c\u5217A\u306b\u5bfe\u3057\u3066\u3001AB-BA=A \u3068\u306a\u308b2\u6b21\u6b63\u65b9\u884c\u5217B\u304c\u5b58\u5728\u3059\u308b\u3068\u304d\u3001tr(A)=0 \u3068 A2=O \u3092\u793a\u305b\u3001\u3068\u3044\u3046\u554f\u984c\u3002\u30c8\u30ec\u30fc\u30b9\u304c0\u306b\u306a\u308b\u3053\u3068\u306f\u6210\u5206\u8a08\u7b97\u3067\u7c21\u5358\u306b\u793a\u305b\u308b\u3002\u3068\u3044\u3046\u304b\u3001tr(AB)=tr(BA) \u3068\u3044\u3046\u826f\u304f\u77e5\u3089\u308c\u305f\u6027\u8cea\u304b\u3089\u81ea\u660e\u306b\u8fd1\u3044\u3002\u3068\u3053\u308d\u304c\u3082\u3046\u4e00\u3064\u306e A2=O \u306e\u65b9\u306f\u7c21\u5358\u3067\u306f\u306a\u3044\u3002\u30cf\u30df\u30eb\u30c8\u30f3\u30fb\u30b1\u30fc\u30ea\u30fc\u3092\u4f7f\u3046\u3068\u3001A2=-det(A) A \u3068\u306a\u308a\u3001\u3053\u308c\u3068\u6761\u4ef6\u5f0f\u304b\u3089\u3042\u308c\u3053\u308c\u3084\u3063\u3066\u3044\u308b\u3068\u3001det(A)=0 \u304c\u51fa\u308b\u306b\u306f\u51fa\u308b\u304c\u3001\u306a\u3093\u304b\u5076\u7136\u4e0a\u624b\u304f\u884c\u3063\u305f\u3068\u3044\u3046\u5370\u8c61\u3067\u3042\u308b\u3002AB-BA=A \u306e\u4e21\u8fba\u306bA\u306e\u51aa\u3092\u639b\u3051\u308b\u3068\u3001A\u306e\u51aa\u306e\u30c8\u30ec\u30fc\u30b9\u306f\u5e38\u306b\u30bc\u30ed\u306b\u306a\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u3002\u3088\u3063\u3066\u3001A\u306e\u56fa\u6709\u5024\u306e\u51aa\u548c\u306f\u3059\u3079\u3066\u30bc\u2026","url":"https://niacin.hatenadiary.org/entry/20061007/p1","blog_url":"https://niacin.hatenadiary.org/","author_name":"niacin","title":"1991\u5e74\u5b66\u7fd2\u9662\u5927(\u7406\u5b66\u90e8)\u306e\u884c\u5217\u306e\u554f\u984c","image_url":null,"blog_title":"\u4e00\u6570\u5b66\u6559\u5e2b\u65e5\u8a18","width":"100%","categories":["\u554f\u984c"],"type":"rich","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/niacin/","published":"2006-10-07 00:00:00","version":"1.0","provider_url":"https://hatena.blog","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fniacin.hatenadiary.org%2Fentry%2F20061007%2Fp1\" title=\"1991\u5e74\u5b66\u7fd2\u9662\u5927(\u7406\u5b66\u90e8)\u306e\u884c\u5217\u306e\u554f\u984c - \u4e00\u6570\u5b66\u6559\u5e2b\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}