{"width":"100%","provider_name":"Hatena Blog","type":"rich","height":"190","version":"1.0","description":"\u5b9a\u7fa9 $K$\u4fc2\u6570\u306e\u4e8c\u6b21\u5f62\u5f0f\u3068\u306f\u3001$n$\u500b\u306e\u5909\u6570$x_1,\\dots,x_n$\u306b\u95a2\u3059\u308b$K$\u4fc2\u6570\u306e\u540c\u6b21\u4e8c\u6b21\u591a\u9805\u5f0f\u3002 \u5373\u3061\u3001$A[x]=\\sum_{i=1}^{n} a_{ii}x_i^2+2\\sum_{i\\verb| \u4f46\u3057\u3001$x = \\left( \\begin{array}{c} x_1 \\\\ \\vdots \\\\ x_n \\end{array} \\right) $ \u4f8b $A(x,y,z) = x^2 + 2y^2 + 3z^2 + 8xy + 10yz + 12zx$ $E[x] = x_1^2 + \\dots + x_n^2$ \u6027\u8cea $n$\u5909\u6570\u306e\u4e8c\u6b21\u5f62\u5f0f\u306f\u3001$n$\u6b21\u5bfe\u79f0\u884c\u5217\u3068\u4e00\u5bfe\u4e00\u5bfe\u5fdc\u3059\u308b\u3002 \u2026","author_url":"https://blog.hatena.ne.jp/arc-cosine/","author_name":"arc-cosine","provider_url":"https://hatena.blog","url":"https://arc-cosine.hatenablog.com/entry/2017/12/07/004236","image_url":null,"categories":["\u7dda\u5f62\u4ee3\u6570"],"blog_title":"Math-Date","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Farc-cosine.hatenablog.com%2Fentry%2F2017%2F12%2F07%2F004236\" title=\"\u4e8c\u6b21\u5f62\u5f0f\u306e\u5b9a\u7fa9 - Math-Date\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://arc-cosine.hatenablog.com/","published":"2017-12-07 00:42:36","title":"\u4e8c\u6b21\u5f62\u5f0f\u306e\u5b9a\u7fa9"}