{"published":"2017-06-17 23:45:12","description":"\u7fa4(group)\u306e\u5b9a\u7fa9 \u3042\u308b\u8981\u7d20\u306e\u96c6\u307e\u308a\u306b\u5bfe\u3057\u3066\u3001\u4e00\u3064\u306e\u6f14\u7b97\u898f\u5247 f \u3092\u6c7a\u3081\u3001\u6f14\u7b97\u7d50\u679c\u306f\u307e\u305f\u8981\u7d20\u306e\u96c6\u307e\u308a\u306e\u4e00\u3064\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3057\u307e\u3059\u3002 a, b, c \u3092\u8981\u7d20\u3068\u3057\u307e\u3059\u3002 1) \u5168\u3066\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u3001\u7d50\u5408\u6cd5\u5247\u304c\u6210\u308a\u7acb\u3064 f(f(a, b), c) = f(a, f(b, c)) 2) \u5168\u3066\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u3001\u5358\u4f4d\u5143\u304c\u5b58\u5728\u3059\u308b 3) \u5168\u3066\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u3001\u9006\u5143\u304c\u5b58\u5728\u3059\u308b \u4f53(field)\u306e\u5b9a\u7fa9 \u3042\u308b\u8981\u7d20\u306e\u96c6\u307e\u308a\u306b\u5bfe\u3057\u3066\u3001\u52a0\u7b97 f \u3068\u4e57\u7b97 g \u3092\u6c7a\u3081\u3001\u6f14\u7b97\u7d50\u679c\u306f\u307e\u305f\u8981\u7d20\u306e\u96c6\u307e\u308a\u306e\u4e00\u3064\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3057\u307e\u3059\u3002 a, b, c\u3092\u8981\u7d20\u3068\u3057\u307e\u3059\u3002 1) \u52a0\u7b97\u306b\u3064\u3044\u3066\u53ef\u63db\u7fa4(\u5358\u4f4d\u5143\u3068\u9006\u5143\u304c\u5b58\u5728\u3059\u308b) 2) \u4e57\u7b97\u306b\u3064\u3044\u3066\u53ef\u2026","width":"100%","provider_url":"https://hatena.blog","categories":["\u7fa4\u74b0\u4f53"],"version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fpebble8888.hatenablog.com%2Fentry%2F2017%2F06%2F17%2F234512\" title=\"\u7fa4\u3001\u4f53\u3001\u6709\u9650\u4f53\u306e\u5b9a\u7fa9 - Pebble Coding\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u7fa4\u3001\u4f53\u3001\u6709\u9650\u4f53\u306e\u5b9a\u7fa9","blog_url":"https://pebble8888.hatenablog.com/","url":"https://pebble8888.hatenablog.com/entry/2017/06/17/234512","provider_name":"Hatena Blog","blog_title":"Pebble Coding","type":"rich","height":"190","image_url":"http://chart.apis.google.com/chart?cht=tx&chl=F_%7Bp%7D","author_name":"pebble8888","author_url":"https://blog.hatena.ne.jp/pebble8888/"}