The course also examines approximation methods: WKB method, variational principle, and perturbation theory.
同时，本课程也解释了几种常用的近似方法：WKB方法、变分原理、以及微扰理论。
The method can make it more approximation to Helmholtz equation and it's answers include WKB approximation.
该法可以更加近似赫姆霍兹方程，且它的解中包含WKB的近似值。
The method can make it more approximation to Helmholtz equation and it's answers include WKB approximation.
该法可以更加近似赫姆霍兹方程，且它的解中包含WKB的近似值。
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