Could anybody explain me why indeed we can express the first-order correction to the n-th wave function [tex]\psi_{n}^{1}[/tex] by linear combination [tex]\sum_{m} c_{m}^{(n)}\psi_{m}^{o}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

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# Formula- first order correction to the n-th wave func

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