Invariant algebras on compact groups

A. L. Rozenberg

Sbornik. Mathematics, Tome 10 (1970) no. 2, pp. 165-172

Résumé

The main result is a description of homogeneous (i.e. invariant relative to left and right shifts) algebras with uniform convergence on a compact group. As a corollary we obtain a generalization of a theorem of Rider: let the real annihilater $A^\perp$ of a homogeneous antisymmetric algebra $A$ be separable in the topology of the definite norm in the conjugate space. Then the connected component of the identity $G_0$ of the group $G$ is commutative and $\dim A^\perp\geq{\operatorname{card}}(G/G_0)$. Rider proved that if $A^\perp=\{0\}$, then $G$ is commutative and connected. Bibliography: 3 titles.