pierre-simonCOCA¹⁶⁴²⁸⁰ 基本例句 🌏西蒙；西蒙先生 Named for Pierre-Simon Laplace, the equation states that the sum of the second partial derivatives the Laplace operator, or Laplacian of an unknown function is zero. 以法国数理学家拉普拉斯命名的这个方程式表述如下：一个未知函数的二级偏微商之和拉普拉斯算符等于零。 chinafanyi.com