i think every system is accurately described by Schrodinger equation.(adsbygoogle = window.adsbygoogle || []).push({});

so what is the point of using old quantum mechanics methods?

with Schrodinger equation, at least numerically, you can solve the eigenvalues and eigenvectors readily and accurately. So what is the point of using approximate methods like WKB or even some strange quantization methods such as EBK?

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# What is the use of WKB after Schrodinger equation is established?

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