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Equalizers and Flatness Properties of Acts, II

Content Provider	Springer Nature Link
Author	Bulman Fleming, S. Kilp, M.
Copyright Year	2003
Abstract	In Comm. Algebra 30 (3) (2002), 1475–1498, Bulman-Fleming and Kilp developed various notions of flatness of a right act A S over a monoid S that are based on the extent to which the functor A S $\otimes -$ preserves equalizers. In Semigroup Forum 65 (3) (2002), 428–449, Bulman-Fleming discussed in detail one of these notions, annihilator-flatness. The present paper is devoted to two more of these notions, weak equalizer-flatness and strong torsion-freeness. An act A S is called weakly equalizer-flat if the functor A S $\otimes -$ “almost” preserves equalizers of any two homomorphisms into the left act S S, and strongly torsion-free if this functor “almost” preserves equalizers of any two homomorphisms from S S into the Rees factor act S (S/S c), where c is any right cancellable element of S. (The adverb “almost” signifies that the canonical morphism provided by the universal property of equalizers may be only a monomorphism rather than an isomorphism.) From the definitions it is clear that flatness implies weak equalizer-flatness, which in turn implies annihilator-flatness, and it was known already that both of these implications are strict. A monoid is called right absolutely weakly equalizer-flat if all of its right acts are weakly equalizer-flat. In this paper we prove a result which implies that right PP monoids with central idempotents are absolutely weakly equalizer-flat. We also show that for a relatively large class of commutative monoids, right absolute equalizer-flatness and right absolute annihilator-flatness coincide. Finally, we provide examples showing that the implication between strong torsion-freeness and torsion-freeness is strict.
Starting Page	209
Ending Page	217
Page Count	9
File Format	PDF
ISSN	00371912
Journal	Semigroup Forum
Volume Number	68
Issue Number	2
e-ISSN	14322137
Language	English
Publisher	Springer US
Publisher Date	2004-02-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Algebra
Content Type	Text
Resource Type	Article
Subject	Algebra and Number Theory

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