Invariant function algebras on compact commutative homogeneous spaces

Details Invariant function algebras on compact commutative homogeneous spaces Invariant function algebras on compact commutative homogeneous spaces

2009-07-16

arxiv.org/abs/0907.2744v1

Moscow Math. J., v. 8, no. 4, p. 697--709 (2008)

Mathematics

Functional Analysis

Overlaps with Section 9 of the preprint math/0603449

Scientific paper

Let $M$ be a commutative homogeneous space of a compact Lie group $G$ and $A$ be a closed $G$-invariant subalgebra of the Banach algebra $C(M)$. A function algebra is called antisymmetric if it does not contain nonconstant real functions. By the main result of this paper, $A$ is antisymmetric if and only if the invariant probability measure on $M$ is multiplicative on $A$. This implies, for example, the following theorem: if $G^{\mathbb C}$ acts transitively on a Stein manifold $\cal M$, $v\in{\cal M}$, and the compact orbit $M=Gv$ is a commutative homogeneous space, then $M$ is a real form of $\cal M$.

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