Is there well known solutions to a differential equation(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\Big(-\frac{\hbar^2}{2m}\partial^2+U\cos\big(\frac{2\pi x}{L}\big)\Big)\Psi(x)=E\Psi(x)?

[/tex]

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# Periodic potential

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