I want to learn the spectral theory of linear elliptic operators in bounded and unbounded domains in $R^n$, in particular for Laplacian and Schrodinger operators. Please suggest me some reference. I have studied second order Elliptic pde from Evans Chapter 6. There he discusses spectrum for case of bounded domain. I want to study how spectrum behaves in case of unbounded domain also. I want to explore functional analytic viewpoint of Elliptic Operators.
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$\begingroup$ The question is to vast. You need to be more specific. $\endgroup$– Piotr HajlaszCommented Jan 11, 2022 at 5:58
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2$\begingroup$ Hoermander's books are a good point to start. However, it depends very much on what you have in mind. From my perspective, I can say that the theory of heat kernels, as in Berline,Getzler,Vergne and Shubin's book were very helpful. $\endgroup$– user473423Commented Jan 11, 2022 at 8:32
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