Characterizing the commutator in varieties with a difference term
Abstract
We extend the validity of Kiss's characterization of the commutator from congruence modular varieties to varieties with a difference term. This fixes a recently discovered gap in our paper [A finite basis theorem for difference-term varieties with a finite residual bound, Trans. Amer. Math. Soc., 368 (2016), 2115--2143]. We also prove some related properties of Kiss terms in varieties with a difference term.
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