Spectral theory of normal C*-algebras
In functional analysis, every C*-algebra is isomorphic to a subalgebra of the C*-algebra B ( H ) {\displaystyle {\mathcal {B}}(H)} of bounded linear operators on some Hilbert space H . {\displaystyle H.} This article describes the spectral theory of closed normal subalgebras of B ( H ) {\displaystyle {\mathcal {B}}(H)} .
Source: Wikipedia — Spectral theory of normal C*-algebras (CC BY-SA 4.0)