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Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, non-self-adjoint operators, random operators/matrices

5 votes

Book on Hilbert spaces, including non-separable

Halmos's Introduction to Hilbert space and the theory of spectral multiplicity is what you are looking for. Since it's published by Dover, the price is very reasonable.
Robert Furber's user avatar
8 votes
Accepted

Is the ring of $p$-adic integers extremally disconnected?

Since questions recirculate to the front page forever if left unanswered, I will amalgamate the comments into an answer, which I've made community wiki. Firstly, by the characterization of the Cantor …
Robert Furber's user avatar