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Apr 25, 2020 at 12:39 comment added Slm2004 Thank you for your comment
Mar 4, 2020 at 10:33 comment added Giorgio Metafune I do not know but I have two suggestions. In the 1d case, the book by A. Zettl is a very detailed treatment of Sturm Liouville problems, maybe you find it there. For the Laplacean, Filonov's proof of the inequality is the easiest and could be adapted to more general Sturm-Liouville operators.
Feb 27, 2020 at 1:27 history edited Slm2004 CC BY-SA 4.0
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Feb 26, 2020 at 17:10 history edited Slm2004 CC BY-SA 4.0
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Feb 26, 2020 at 14:28 history asked Slm2004 CC BY-SA 4.0