亥姆霍兹方程

{{#category_index:H|Helmholtz equation}} 时域中依赖空间的谐波波动方程：

$\left(\nabla ^{2}+\kappa ^{2}\right)\psi =0$,

其中 $\kappa =\omega /V$, $\omega$=角频率, 且 V=velocity.

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