{"description":"\u3055\u3066\u3001\u300c\u77db\u76fe\u304b\u3089\u306f\u4f55\u3067\u3082\u51fa\u3066\u304f\u308b\u300d(Ex falso quodlibet) \u306b\u3064\u3044\u3066\u898b\u3066\u307f\u308b\u3002\u6238\u7530\u5c71\u672c\u306e\u307e\u3093\u307e\u30d1\u30af\u30ea\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u5fc3\u82e6\u3057\u3044\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u306e\u3067\u3061\u3087\u3063\u3068(\u4ee5\u4e0a\u306b)\u5f15\u7528\u3059\u308b\u3002$P \\to Q$ \u304a\u3088\u3073 $\\lnot Q$ \u304a\u3088\u3073 $P$ \u3068\u3044\u3046\u524d\u63d0\u304b\u3089 $R$ \u3092\u5c0e\u304f\u8ad6\u8a3c\u304c\u59a5\u5f53\u3067\u3042\u308b\u3053\u3068\u3092\u898b\u305f\u3044\u3002 \u3053\u3053\u3067 $A_1, A_2, \\cdots, A_m $ \u304b\u3089 $C$ \u3092\u5c0e\u304f\u8ad6\u8a3c\u304c\u59a5\u5f53\u3067\u3042\u308b\u3001\u6216\u306f $A_1, A_2, \\cdots, A_m $ \u304b\u3089 $C$ \u304c\u8ad6\u7406\u7684\u5e30\u7d50\u3068\u3057\u3066\u5f97\u3089\u308c\u308b\u3053\u3068\u3092 $A_1, A_2, \\cdots, A_m \\vDash C$ \u3068\u66f8\u304d\u3001\u300c$A_1, A\u2026","type":"rich","author_url":"https://blog.hatena.ne.jp/derwind/","blog_title":"\u3089\u3093\u3060\u3080\u306a\u8a18\u61b6","title":"\u8a18\u53f7\u8ad6\u7406\u5b66(4)","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2016%2F02%2F20%2F161338\" title=\"\u8a18\u53f7\u8ad6\u7406\u5b66(4) - \u3089\u3093\u3060\u3080\u306a\u8a18\u61b6\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"derwind","width":"100%","url":"https://randommemory.hatenablog.com/entry/2016/02/20/161338","blog_url":"https://randommemory.hatenablog.com/","provider_url":"https://hatena.blog","image_url":null,"categories":["logic"],"published":"2016-02-20 16:13:38","provider_name":"Hatena Blog","height":"190","version":"1.0"}