{"categories":["math-numerical"],"author_url":"https://blog.hatena.ne.jp/derwind/","description":"C. E. Shannon\u306e\u5b9a\u7406\u3068\u3044\u3046\u5f62\u3067\u77e5\u3089\u308c\u3066\u3044\u308b\u3084\u3064\u3002\u7d50\u69cb\u9762\u5012\u305d\u3046\u3060\u304b\u3089\u305a\u3063\u3068\u653e\u7f6e\u3057\u3066\u305f\u3051\u3069\u3001\u6848\u5916\u672c\u8cea\u90e8\u5206\u306f\u7c21\u5358\u3060\u3063\u305f\u3002 \u60c5\u5831\u7406\u8ad6 (\u3061\u304f\u307e\u5b66\u82b8\u6587\u5eab) | \u7518\u5229 \u4fca\u4e00 | \u672c | Amazon.co.jp\u306e\u7b2c2\u7bc0 \u5b9a\u74064.1\u3092\u601d\u3044\u3063\u304d\u308a\u7c21\u7565\u5316\u3057\u3066(\u304b\u3064\u8208\u9192\u3081\u306a\u30b9\u30d1\u30a4\u30b9\u3092\u52a0\u3048\u3066)\u30e1\u30e2\u308b\u3002 \u5b9a\u7406(\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u5b9a\u7406) $u \\in C^0(\\mathbb{R})$\u3068\u3057\u3001$\\lim_{|t| \\to \\infty} (1 + |t|^2)|u(t)| \\to 0$\u3092\u6e80\u305f\u3059\u3068\u3059\u308b\u3002\u307e\u305f\u3001$u$\u306eFourier\u5909\u63db$\\mathcal{F}u = \\widehat{u}$\u306e\u53f0\u304c\u30b3\u30f3\u30d1\u30af\u30c8\u3067\u3042\u308b\u3068\u3059\u308b\u3002\u2026","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2015%2F08%2F24%2F003020\" title=\"\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0(\u6a19\u672c\u5316)\u5b9a\u7406 - \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>","width":"100%","url":"https://randommemory.hatenablog.com/entry/2015/08/24/003020","version":"1.0","author_name":"derwind","blog_url":"https://randommemory.hatenablog.com/","title":"\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0(\u6a19\u672c\u5316)\u5b9a\u7406","published":"2015-08-24 00:30:20","image_url":null,"blog_title":"\u3089\u3093\u3060\u3080\u306a\u8a18\u61b6","provider_name":"Hatena Blog","type":"rich","height":"190"}