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Who came up with the idea of solving elliptic equations with periodic potentials and from there solving elliptic equations with asymptotically periodic potentials?

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  • $\begingroup$ On my opinion, this question belongs to another site, hsm.stackexchange.com $\endgroup$ – Alexandre Eremenko Aug 11 at 5:02
  • $\begingroup$ If by "solve" you mean "find explicit solutions," then even the simplest examples such as $y''+(\sin x) y=0$ cannot be solved in this sense. $\endgroup$ – Christian Remling Aug 11 at 18:32

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