Monoids over which products of indecomposable acts are indecomposable

Abstract

In this paper we prove that for a monoid S, products of indecomposable right S-acts are indecomposable if and only if S contains a right zero. Besides, we prove that subacts of indecomposable right S-acts are indecomposable if and only if S is left reversible. Ultimately, we prove that the one element right S-act S is product flat if and only if S contains a left zero.

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