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Increasing chains of ideals and orbit closures in $ \beta{\bf Z}$

Authors: Neil Hindman, Jan van Mill and Petr Simon
Journal: Proc. Amer. Math. Soc. 114 (1992), 1167-1172
MSC: Primary 54D35
MathSciNet review: 1089407
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Abstract: Given any discrete semigroup $ (S, + )$, there is an extension of the operation to $ \beta S$ making $ (\beta S, + )$ a left topological semigroup. The aim of this paper is, among other things, to prove that there exist strictly increasing chains of principle left ideals and of principal closed ideals in $ (\beta \mathbb{Z}, + )$.

References [Enhancements On Off] (What's this?)

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Keywords: Shift function, $ \beta \mathbb{Z}$, ideal, semigroup
Article copyright: © Copyright 1992 American Mathematical Society

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