##### 调和函数 - 调和函数 - **调和函数**是满足拉普拉斯方程的二阶连续可微的[[实函数]] - ${\displaystyle {\frac {\partial ^{2}f}{\partial x_{1}^{2}}}+{\frac {\partial ^{2}f}{\partial x_{2}^{2}}}+\cdots +{\frac {\partial ^{2}f}{\partial x_{n}^{2}}}=0}$