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43A20 - $L^1$-algebras on groups, semigroups, etc. [MSC 2020] |
43A65 - Representations of groups, semigroups, etc. (aspects of abstract harmonic analysis) [MSC 2020] |
46C05 - Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) [MSC 2020] |
46H05 - General theory of topological algebras [MSC 2020] |
46J05 - General theory of commutative topological algebras [MSC 2020] |
46K10 - Representations of topological algebras with involution [MSC 2020] |
46L05 - General theory of C*-algebras [MSC 2020] |
46L10 - General theory of von Neumann algebras [MSC 2020] |
47A25 - Spectral sets of linear operators [MSC 2020] |
47B15 - Hermitian and normal operators (spectral measures, functional calculus, etc.) [MSC 2020] |