Algebraic characterizations of some relative notions of size
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Publication:6368109
DOI10.1007/S00233-021-10215-9arXiv2105.09723MaRDI QIDQ6368109
John H. Johnson, Cory Christopherson
Publication date: 20 May 2021
Abstract: We obtain algebraic characterizations of relative notions of size in a discrete semigroup that generalize the usual combinatorial notions of syndetic, thick, and piecewise syndetic sets. "Filtered" syndetic and piecewise syndetic sets were defined and applied earlier by Shuungula, Zelenyuk, and Zelenyuk [24]. Other instances of these relative notions of size have appeared explicitly (and more often implicitly) in the literature related to the algebraic structure of the Stone-v{C}ech compactification. Building on this prior work, we observe a natural duality and demonstrate how these notions of size may be composed to characterize previous notions of size (like piecewise syndetic sets) and serve as a convenient description for new notions of size.
Ideal theory for semigroups (20M12) Transformation groups and semigroups (topological aspects) (54H15) Structure of topological semigroups (22A15) Ramsey theory (05D10) Special constructions of topological spaces (spaces of ultrafilters, etc.) (54D80)
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