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math.RA2007
Mal'cev conditions from graphs for congruences and tolerances
Paolo Lipparini
In a previous paper (From congruence identities to tolerance identities, in print on Acta Sci. Math. Szeged) we showed that, under certain conditions, a variety satisfies a given c…
math.RA2006
Towards Commutator theory for relations. IV
Paolo Lipparini
We provide more characterizations of varieties having a term Mal'cev modulo two functions and . We characterize varieties neutral in the sense of , that is varieties sati…