Semi-algebraic groups and the local closure of an orbit in a homogeneous space

Author:

Goto Morikuni

Abstract

Let L be a topological group acting on a locally compact Hausdorff space M as a transformation group. Let m be in M. A subset Q of M is called the local closure of the orbit Lm if Q is the smallest locally compact invariant subset of M with m Q m\, \in \,Q . A partition \[ M = λ Q λ , Q λ Q μ = ( λ μ ) M = \,\bigcup \limits _{\lambda \in \wedge } \,{Q_\lambda },\,\,\,\,{Q_{\lambda \,}}\, \cap \,\,{Q_\mu } = \,\emptyset \,\,\,\,\left ( {\lambda \ne \mu } \right ) \] is called an LC-partition of M with respect to the L action if each Q λ {Q_\lambda } is the local closure of Lm for any m in Q λ {Q_\lambda } . Theorem. Let G be a connected Lie group, and let A and B be subgroups of G with only finitely many connected components. Suppose that B is closed. Then the factor space G / B G/B has an LC-partition with respect to the A action.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference6 articles.

1. Orbits of one-parameter groups. III. Lie group case;Goto, Morikuni;J. Math. Soc. Japan,1971

2. Products of two semi-algebraic groups;Goto, Morikuni;J. Math. Soc. Japan,1973

3. Non-discrete uniform subgroups of semisimple Lie groups;Goto, Morikuni;Math. Ann.,1972

4. Pure and Applied Mathematics, Vol. XII;Helgason, Sigurđur,1962

5. On some types of topological groups;Iwasawa, Kenkichi;Ann. of Math. (2),1949

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