Geodesic
Some results on central extensions of crossed modules
Homology, homotopy, and applications, Tome 4 (2002) no. 1, pp. 29-42.

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

In this paper certain central extensions of crossed modules are classified. For these extensions, we obtain several results which extend the classical ones for central extensions of groups. In particular, central stem extensions of a perfect crossed module are classified in terms of a second integral homology crossed module.
DOI : 10.4310/HHA.2002.v4.n1.a3
Classification : 18G50, 18Gxx, 20Jxx
Keywords: crossed module, central extension, stem extension 
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J. M. Casas; A. M. Vieites. Some results on central extensions of crossed modules. Homology, homotopy, and applications, Tome 4 (2002) no. 1, pp. 29-42. doi : 10.4310/HHA.2002.v4.n1.a3. http://geodesic.mathdoc.fr/articles/10.4310/HHA.2002.v4.n1.a3/

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