\bigtriangleup=\sum_{i=1}^d\frac{\partial^2}{\partial x_i^2}
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Recent Referers:
  1. http://formula.s21g.com/?%5Cbigtriangleup%3D%5Csum_%7Bi%3...
  2. https://mkprob.hatenablog.com/entry/20121114/1352865401
  3. http://formula.s21g.com/
  4. http://mkprob.hatenablog.com/entry/20130220/1361363246
  5. http://d.hatena.ne.jp/