{"author_url":"https://blog.hatena.ne.jp/derwind/","height":"190","url":"https://randommemory.hatenablog.com/entry/2016/02/06/123714","provider_name":"Hatena Blog","title":"\u570f\u8ad6(22)\u3068\u7d9a arrows-only metacategory","version":"1.0","type":"rich","blog_url":"https://randommemory.hatenablog.com/","author_name":"derwind","width":"100%","published":"2016-02-06 12:37:14","provider_url":"https://hatena.blog","blog_title":"\u3089\u3093\u3060\u3080\u306a\u8a18\u61b6","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2016%2F02%2F06%2F123714\" title=\"\u570f\u8ad6(22)\u3068\u7d9a arrows-only metacategory - \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>","categories":["math-category"],"description":"\u570f\u8ad6(1) - \u3089\u3093\u3060\u3080\u306a\u8a18\u61b6\u3067\u3075\u308c\u305f category \u306e\u5b9a\u7fa9\u3068 \u570f\u8ad6(21)\u3068 arrows-only metacategory - \u3089\u3093\u3060\u3080\u306a\u8a18\u61b6\u3067\u3075\u308c\u305f arrows-only metacategory \u306e\u5b9a\u7fa9\u306e\u540c\u5024\u6027\u3092\u898b\u308b\u3002 \u570f\u8ad6(20) - \u3089\u3093\u3060\u3080\u306a\u8a18\u61b6\u3067\u3075\u308c\u305f\u3053\u3068\u3082\u91cd\u8981\u306b\u306a\u308b\u3002category \u306e\u610f\u5473\u3067\u306e identity arrow \u306f object \u306b\u5bfe\u3057\u3066\u5b58\u5728\u3057\u3066\u4e00\u610f\u306b\u5b9a\u307e\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3042\u308b\u3002Mac Lane\u672c\u3067\u306f category \u306e\u610f\u5473\u3067\u306e object $b$ \u3092\u3068\u308b\u6642\u3001\u305d\u306e identity arrow $1_b$ \u3092 $b$ \u81ea\u8eab\u3068\u540c\u4e00\u8996\u3057\u3066 $b: b \\to\u2026"}