Varieties whose tolerances are homomorphic images of their congruences

Details Varieties whose tolerances are homomorphic images of their congruences Varieties whose tolerances are homomorphic images of their congruences

2012-04-10

arxiv.org/abs/1204.2228v1

Mathematics

Rings and Algebras

Scientific paper

The homomorphic image of a congruence is always a tolerance (relation) but, within a given variety, a tolerance is not necessarily obtained this way. By a Maltsev-like condition, we characterize varieties whose tolerances are homomorphic images of their congruences (TImC). As corollaries, we prove that the variety of semilattices, all varieties of lattices, and all varieties of unary algebras have TImC. We show that a congruence n-permutable variety has TImC if and only if it is congruence permutable, and construct an idempotent variety with a majority term that fails TImC.

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