PlanetPhysics/Polish G Space
Let be a topological -space, and its associated topological group (that is, such that an action of on is continuous if is continuous). If is a Polish group and is also a Polish space, then is called a Polish G-space .
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edit- ↑ Howard Becker, Alexander S. Kechris. 1996. The Descriptive Set Theory of Polish Group Actions Cambridge University Press: Cambridge, UK, p.14.