Boolean Factor Congruences and Property (*)

Details Boolean Factor Congruences and Property (*) Boolean Factor Congruences and Property (*)

2008-09-22

arxiv.org/abs/0809.3815v1

Mathematics

Logic

Scientific paper

A variety V has Boolean factor congruences (BFC) if the set of factor congruences of every algebra in V is a distributive sublattice of its congruence lattice; this property holds in rings with unit and in every variety which has a semilattice operation. BFC has a prominent role in the study of uniqueness of direct product representations of algebras, since it is a strengthening of the refinement property. We provide an explicit Mal'cev condition for BFC. With the aid of this condition, it is shown that BFC is equivalent to a variant of the definability property (*), an open problem in R. Willard's work ("Varieties Having Boolean Factor Congruences," J. Algebra, 132 (1990)).

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