Mathematics – Rings and Algebras
Scientific paper
2006-05-11
Mathematics
Rings and Algebras
16 pages
Scientific paper
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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