## Mathematics Subject Classification – MSC2020

Inner product spaces and their generalizations, Hilbert spaces {For function spaces, see 46Exx} 5118

Rings and algebras of continuous, differentiable or analytic functions {For Banach function algebras, see 46J10, 46J15} 1093

Topological algebras, normed rings and algebras, Banach algebras {For group algebras, convolution algebras and measure algebras, see 43A10, 43A20} 7158