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Relative commutator theory in varieties of omega-groups

Tomas Everaert

math.RAarXiv:math/0605305

Abstract

We introduce a new notion of commutator which depends on a choice of subvariety in any variety of omega-groups. We prove that this notion encompasses Higgins's commutator, Froehlich's central extensions and the Peiffer commutator of precrossed modules.

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