Characterizing semigroups XX with commutative extensions φ(X)φ(X), λ(X)λ(X), N2(X)N_2(X), υ(X)\upsilon(X)

preprint2013arXivOpen access

Abstract

We characterize semigroups XX whose semigroups of filters φ(X)φ(X), maximal linked systems λ(X)λ(X), linked upfamilies N2(X)N_2(X), and upfamilies υ(X)\upsilon(X) are commutative.

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