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46-XX - Functional analysis [MSC 2020] |
46A03 - General theory of locally convex spaces [MSC 2020] |
46A30 - Open mapping and closed graph theorems; completeness (including $B$-, $B_r$-completeness) [MSC 2020] |
46B03 - Isomorphic theory (including renorming) of Banach spaces [MSC 2020] |
46B10 - Duality and reflexivity in normed linear and Banach spaces [MSC 2020] |
46B15 - Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces [MSC 2020] |
46C05 - Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) [MSC 2020] |
47-XX - Operator theory [MSC 2020] |
47A10 - Spectrum, resolvent [MSC 2020] |
47B15 - Hermitian and normal operators (spectral measures, functional calculus, etc.) [MSC 2020] |
47B25 - Linear symmetric and selfadjoint operators (unbounded) [MSC 2020] |