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Published online by Cambridge University Press: 04 September 2008
We study Quillen's model category structure for homotopy of simplicial objects in the context of Janelidze, Márki and Tholen's semi-abelian categories. This model structure exists as soon as is regular Mal'tsev and has enough regular projectives; then the fibrations are the Kan fibrations of S
. When, moreover,
is semi-abelian, weak equivalences and homology isomorphisms coincide.