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Title: A note on double central extensions in exact Mal'tsev categories
Authors: Everaert, Tomas 
Linden, Tim Van der 
Keywords: Categorical Galois theory; Barr exact Mal'tsev category; Higher central extension; Commutator
Issue Date: 2009
Publisher: Centro de Matemática da Universidade de Coimbra
Citation: Pré-Publicações DMUC. 09-06 (2009)
Abstract: The characterisation of double central extensions in terms of commutators due to Janelidze (in the case of groups), Gran and Rossi (in the case of Mal'tsev varieties) and Rodelo and Van der Linden (in the case of semi-abelian categories) is shown to be still valid in the context of exact Mal'tsev categories.
Rights: openAccess
Appears in Collections:FCTUC Matemática - Vários

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