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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Quasi-nilpotent sets in semigroups

Author: H. L. Chow
Journal: Proc. Amer. Math. Soc. 52 (1975), 393-397
MSC: Primary 43A05
MathSciNet review: 0374809
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Abstract: In a compact semigroup $ S$ with zero 0, a subset $ A$ of $ S$ is called quasi-nilpotent if the closed semigroup generated by $ A$ contains 0. A probability measure $ \mu $ on $ S$ is called nilpotent if the sequence $ ({\mu ^n})$ converges to the Dirac measure at 0. It is shown that a probability measure is nilpotent if and only if its support is quasi-nilpotent. Consequently, the set of all nilpotent measures on $ S$ is convex and everywhere dense in the set of all probability measures on $ S$ and the union of their supports is $ S$.

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Keywords: Quasi-nilpotent set, compact semigroup with zero, probability measure, support of a measure, nilpotent measure, nil semigroup
Article copyright: © Copyright 1975 American Mathematical Society