{"title":"\u9006\u50cf\u304c\u50cf\u3088\u308a\u81ea\u7136\u306a\u7406\u7531","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","height":"190","description":"\u5351\u8fd1\u306a\u4f8b \u9006\u50cf\u304c\u50cf\u3088\u308a\u81ea\u7136\u306a\u6982\u5ff5\u3067\u3042\u308b\u3068\u3044\u3046\u8a71\u3092\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u591a\u304f\u306e\u4eba\u306f\u53d7\u9a13\u6570\u5b66\u306e\u60aa\u3057\u304d\u696d\u754c\u7528\u8a9e\u300c\u9806\u50cf\u6cd5\u30fb\u9006\u50cf\u6cd5\u300d\u306b\u95a2\u3059\u308b\u8a71\u3060\u3068\u53d7\u3051\u6b62\u3081\u3066\u3057\u307e\u3046\u3088\u3046\u306a\u306e\u3067\u3001\u5c11\u3057\u3060\u3051\u5553\u8499\u7684\u306a\u8a71\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002 \u5199\u50cf $f\\colon X\\to Y$ \u306b\u3088\u308b $A\\subset X$ \u306e\u50cf $f[A]$ \u3068\u306f\u96c6\u5408 $\\lbrace y\\in Y\\mid\\exists x\\in A.\\ f(x)=y\\rbrace$ \u306e\u3053\u3068\u3067\u3042\u308a\u3001$B\\subset Y$ \u306e\u9006\u50cf $f ^ {-1} [B]$ \u3068\u306f\u96c6\u5408 $\\lbrace x\\in X \\mid f(x)\\in B\\rbrace$ \u306e\u3053\u3068\u3067\u3059\u3002\u53d7\u9a13\u6570\u5b66\u306e\u300c\u8ecc\u8de1\u3092\u6c42\u2026","blog_title":"\u7a7a\u8ad6\u4e0a\u306e\u7802\u3001\u697c\u95a3\u4e0a\u306e\u673a\u3002","width":"100%","author_name":"all_for_nothing","url":"https://all-for-nothing.com/entry/2021/11/22/064406","published":"2021-11-22 06:44:06","version":"1.0","blog_url":"https://all-for-nothing.com/","author_url":"https://blog.hatena.ne.jp/all_for_nothing/","type":"rich","categories":["\u6570\u5b66"],"image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fall-for-nothing.com%2Fentry%2F2021%2F11%2F22%2F064406\" title=\"\u9006\u50cf\u304c\u50cf\u3088\u308a\u81ea\u7136\u306a\u7406\u7531 - \u7a7a\u8ad6\u4e0a\u306e\u7802\u3001\u697c\u95a3\u4e0a\u306e\u673a\u3002\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}