Category theorems for stable semigroups

Details Category theorems for stable semigroups Category theorems for stable semigroups

2008-05-07

arxiv.org/abs/0805.1024v1

Ergodic Theory Dynamical Systems 29 (2009), 487-494

Mathematics

Functional Analysis

8 pages. To appear in Ergodic Theory and Dynamical Systems

Scientific paper

Inspired by the classical category theorems of Halmos and Rohlin for the discrete measure preserving transformations, we prove analogous results in the abstract setting of unitary and isometric C_0-semigroups on a separable Hilbert space. More presicely, we show that the set of all weakly stable unitary groups (isometric semigroups) is of first category, while the set of all almost weakly stable unitary groups (isometric semigroups) is residual for an appropriate topology.

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