Fwiw, where I'm at... https://www.youtube.com/watch?v=gI0DYD2FhtE
or probably more accurately: https://www.stat.uchicago.edu/~lekheng/work/psapm.pdf https://www.math.stonybrook.edu/~bishop/classes/math638.F20/Canzani_Laplacian_Notes.pdf Except, not in the domain of physics of course. Some on list may have done the work before (or recently) of recovering proper geometry from what otherwise is a dearth of isospectral properties. I would love to know who out there might be worth having a discussion with regarding such techniques, limitations and frontiers.
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