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47-XX - Operator theory [MSC 2020] |
47A60 - Functional calculus for linear operators [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] |
47A55 - Perturbation theory of linear operator [MSC 2020] |
47A40 - Scattering theory of linear operators [MSC 2020] |
46Cxx - Inner product spaces and their generalizations, Hilbert spaces [MSC 2020] |
47E05 - General theory of ordinary differential operators [MSC 2020] |
47F05 - General theory of partial differential operators [MSC 2020] |