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Jan 25, 2022 at 17:55 comment added Y Wu Thanks for the comments! I think I found a counter example: $\Delta (U\phi)/U=\lambda \phi$
Jan 25, 2022 at 16:06 comment added Giorgio Metafune See also this related post mathoverflow.net/questions/409944/…
Jan 25, 2022 at 13:48 comment added Scott Armstrong I believe that this convection diffusion operator is a good examples of a non-normal operator for which the spectral theory is more complicated. See the first couple of pages of the introduction of this survey: arxiv.org/pdf/1002.4844.pdf
S Jan 25, 2022 at 4:04 review First questions
Jan 25, 2022 at 4:19
S Jan 25, 2022 at 4:04 history asked Y Wu CC BY-SA 4.0