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Mar 5, 2020 at 3:25 vote accept DuFong
Mar 5, 2020 at 3:25 comment added DuFong I found those locations result in Titchmarsh VII, 7.1.7, thanks for the hint.
Mar 5, 2020 at 2:51 comment added DuFong Any theorems about the locations of those eigenvalues? Without knowing any (fundamental) solutions
Mar 4, 2020 at 23:10 history answered Giorgio Metafune CC BY-SA 4.0