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Proceedings of the American Mathematical Society

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Invariant measures on locally compact semigroups


Author: Roger Rigelhof
Journal: Proc. Amer. Math. Soc. 28 (1971), 173-176
MSC: Primary 28.75; Secondary 42.00
DOI: https://doi.org/10.1090/S0002-9939-1971-0277691-3
MathSciNet review: 0277691
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Abstract: The main result of this paper shows that a locally compact abelian semigroup is embeddable as an open subsemigroup of a locally compact abelian group $ G$ if and only if the translations $ x \mapsto x + y$ are open maps and there exists a nonnegative regular measure $ \mu $ on $ S$ such that $ \mu (U) = \mu (x + U) > 0$ for every open set $ U$ and $ x$ in $ S$.


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Additional Information

DOI: https://doi.org/10.1090/S0002-9939-1971-0277691-3
Keywords: Invariant measures, Haar measures, locally compact abelian semigroups, topological semigroups
Article copyright: © Copyright 1971 American Mathematical Society

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