Pretty neat!
Too bad it does not generalize to eigenvalues/eigenfunctions for operators in Banach spaces 
https://twitter.com/InertialObservr/status/1194797425870831616 …
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It doesn't. Not even for Laplace operator, check this out: https://en.wikipedia.org/wiki/Hearing_the_shape_of_a_drum …
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well of course there's no generalization now, the paper came out less than a month ago
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