{"categories":["\u6570\u5b66"],"url":"https://flappphys.hatenablog.com/entry/20081207/p1","blog_url":"https://flappphys.hatenablog.com/","description":"\u6b21\u7b2c\u306bFeynman\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u304d\u305f\u6c17\u304c\u3059\u308b\uff0e\u305d\u308c\u306b\u3057\u3066\u3082\u865a\u6642\u9593\u306f\u3046\u307e\u304f\u3067\u304d\u3066\u308b\u306a\u3041... \u57fa\u5e95\u72b6\u614b\u3067\u631f\u3093\u3067N\u7a4d\u304c\u5168\u90e8\u6d88\u3048\u308b\u3068\u304d\u306eWick\u306e\u5b9a\u7406\u306b\u304a\u3051\u308b\u7e2e\u7d04\u306e\u4f5c\u308a\u65b9\u306f\uff0c\u4e00\u822c\u306b2n\u500b\u306e\u6f14\u7b97\u5b50\u306b\u5bfe\u3057\u3066 \u901a\u308a\u3042\u308b\u306e\u304b\u306a\uff0e2n\u500b\u306e\u533a\u5225\u3067\u304d\u308b\u7389\u3092n\u672c\u306e\u533a\u5225\u3067\u304d\u308b\u7d10\u3067\u7d50\u3076\u3068\u3057\u3066\uff0c1\u672c\u76ee\u306e\u7d10\u306b\u4ed8\u304f\u7389\u306e\u9078\u3073\u65b9\u304c 2n(2n-1)/2 \u901a\u308a\uff0c2\u672c\u76ee\u306e\u7d10\u306b\u4ed8\u304f\u7389\u306e\u9078\u3073\u65b9\u304c (2n-2)(2n-3)/2 \u901a\u308a\uff0c... \u3067\u5168\u90e8\u639b\u3051\u308b\u3068 (2n)!/2^n \u901a\u308a\u3067\uff0c\u5b9f\u969b\u306b\u306f\u7d10\u306b\u533a\u5225\u306f\u306a\u3044\u306e\u3067 n! \u3067\u5272\u308b\uff0e !! \u3067\u306e\u8868\u793a\u306f\u6a19\u6e96\u7684\u306a\u516c\u5f0f\u3060\u304c (2n)! = (2n)!! (2n-1)!! \u3068 (2n\u2026","type":"rich","provider_url":"https://hatena.blog","blog_title":"flatline\u306e\u65e5\u8a18\u8de1\u5730","height":"190","author_url":"https://blog.hatena.ne.jp/flappphys/","image_url":null,"provider_name":"Hatena Blog","width":"100%","title":" Wick\u306e\u5b9a\u7406\u306e\u9762\u5012\u81ed\u3055","published":"2008-12-07 00:00:00","author_name":"flappphys","version":"1.0","html":""}