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Feb 18, 2021 at 23:30 history edited user7868 CC BY-SA 4.0
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Feb 18, 2021 at 23:30 comment added user7868 I've asked a related question about whether separable eigenfunctions are the only example of this: mathoverflow.net/questions/384367/….
Feb 18, 2021 at 22:46 history answered user7868 CC BY-SA 4.0