On quasi-antiorder in semigroups

Daniel A. Romano

Displaying similar documents to “On quasi-antiorder in semigroups”

A note on the quasi-antiorder in a semigroup.

Romano, Daniel Abraham (2007)

Novi Sad Journal of Mathematics

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A note of a family of quasi-antiorders on semigroup

Daniel Abraham Romano (2005)

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On some classes of good quotient relations.

Bošnjak, Ivica, Madarász, Rozália (2002)

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On quasi-p-bounded subsets

M. Sanchis, A. Tamariz-Mascarúa (1999)

Colloquium Mathematicae

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The notion of quasi-p-boundedness for p ∈ $ω^{*}$ is introduced and investigated. We characterize quasi-p-pseudocompact subsets of β(ω) containing ω, and we show that the concepts of RK-compatible ultrafilter and P-point in $ω^{*}$ can be defined in terms of quasi-p-pseudocompactness. For p ∈ $ω^{*}$ , we prove that a subset B of a space X is quasi-p-bounded in X if and only if B × $P_{R K} (p)$ is bounded in X × $P_{R K} (p)$ , if and only if $c l_{β (X \times P_{R K} (p))} (B \times P_{R K} (p)) = c l_{β X} B \times β (ω)$ , where $P_{R K} (p)$ is the set of Rudin-Keisler predecessors of p.