FelipeG
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Registered User
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PhD Student.
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Apr 22 |
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Is function from topological group to metric space Borel? Thanks for your comment. There is something I don't understand. Are you assuming the closure of the identity is not a single point? Is this is necessarily true? |
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Apr 22 |
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Is function from topological group to metric space Borel? Sure. The multiplication of g is a dynamical system, a rotation in a compact abelian group. I want to construct a dynamical isomorphism from a dynamical system in X to G. |
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Apr 21 |
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Existence of limit measure Thanks for your comments. Theorem 4.3 talks about two kinds of limits. The other limit is the outer measure constructed in section 3. Theorem 3.3 mentions that the outer measure is Radon (hence every borel set is measurable) if every open set is the countable union of compact sets. |
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Apr 21 |
asked | Is function from topological group to metric space Borel? |
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Apr 20 |
asked | Existence of limit measure |
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Feb 28 |
asked | Extension of measures from the ball sigma-algebra to the borel sigma-algebra |
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Feb 7 |
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Do ergodic isometries have discrete spectrum? Sure, a theorem by Halmos and Von Neumann state that T is transitive (one dense orbit) and isometric, iff it is topologically isomoprhic to a minimal rotation on a compact abelian group iff T is minimal and has discrete topological spectrum. (topological because in this case the operator associated to the dynamical system is acting on the space of continuous functions. ) A good reference for this is An introduction to ergodic theory by Peter Walters. |
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Feb 7 |
asked | Do ergodic isometries have discrete spectrum? |
