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Mar 16, 2023 at 11:47 answer added mcd timeline score: 3
Mar 16, 2023 at 10:39 comment added Igor Khavkine I don't have a canonical reference, but by my recollection the underlying logic is that $D$ has a compact resolvent and the properties that you want follow from the spectral properties of (normal/self-adjoint) compact operators. The compactness follows from the representation of the resolvent as an integral kernel, possibly checking that it is Hilbert-Schmidt.
Mar 16, 2023 at 10:03 history asked asv CC BY-SA 4.0