Geodesic
The 3-by-3 lemma for regular Goursat categories
Homology, homotopy, and applications, Tome 6 (2004) no. 1, pp. 1-3.

Voir la notice de l'article provenant de la source International Press of Boston

We prove a 3 x 3 lemma for regular Goursat categories.
DOI : 10.4310/HHA.2004.v6.n1.a1
Classification : 18A32, 18B10, 18G50
Keywords: non-abelian homological algebra, calculus of relations, Mal’cev category 
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Stephen Lack. The 3-by-3 lemma for regular Goursat categories. Homology, homotopy, and applications, Tome 6 (2004) no. 1, pp. 1-3. doi : 10.4310/HHA.2004.v6.n1.a1. http://geodesic.mathdoc.fr/articles/10.4310/HHA.2004.v6.n1.a1/

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