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  <blog_title>Notes_JP</blog_title>
  <blog_url>https://www.mynote-jp.com/</blog_url>
  <categories>
    <anon>物理学</anon>
    <anon>物理学-物理数学</anon>
  </categories>
  <description>POINT 個人的にすごい！と思った計算の備忘録です． 覚えておくと応用がきくかもしれません． ラプラシアンの計算 ラプラシアンの計算ラプラシアンの計算\begin{aligned} \boldsymbol{\nabla}^2 f(r) &amp;=\biggl( \frac{\mathrm{d}^2}{\mathrm{d} r^2} +\frac{2}{r}\frac{\mathrm{d}}{\mathrm{d} r} \biggr) f(r)\\ &amp;=\frac{1}{r} \frac{\mathrm{d}^2}{\mathrm{d} r^2} \bigl[ r\cdot f(r) \bigr] …</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2015-09-01 00:00:00</published>
  <title>ちょっと感動した計算</title>
  <type>rich</type>
  <url>https://www.mynote-jp.com/entry/impressive-method</url>
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