Topological Invariant Means and Action of Locally Compact Semitopological Semigroups

  • Author / Creator
    Huang, Qianhong
  • Let a locally compact semitopological semigroup S have a separately con- tinuous left action on a locally compact Hausdorff X. We define a jointly continuous left action of the measure algebra M(S) on the bounded Borel measure space M(X) which is an analogue of the convolution of measure alge- bras M(S). We further introduce a separately continuous left action of M(S) on the dual of a M(S)-invariant subspace A of M(X)∗ in analogue with Arens product. We consider the fixed point of this action on the set of means on A (topological S-invariant mean on A) and characterize its existence in analogue with topological right stationary, ergodic properties, Dixmier condition etc. A notion of topological (S, A)-lumpy is introduced and its relation with topolog- ical S-invariant mean on A is studied. The relation of existence of topological invariant means on a subspace of X and on X itself is also studied.

  • Subjects / Keywords
  • Graduation date
    Fall 2015
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
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