Geodesic
Groupoids and crossed objects in algebraic topology
Homology, homotopy, and applications, Tome 1 (1999) no. 1, pp. 1-78.

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

This is an introductory survey of the passage from groups to groupoids and their higher dimensional versions, with most emphasis on calculations with crossed modules and the construction and use of homotopy double groupoids.
DOI : 10.4310/HHA.1999.v1.n1.a1
Classification : 01A60, 18Dxx, 18G55, 20Lxx, 55-02, 55-03, 55Q05
Keywords: homotopy theory, groupoids, multiple groupoids, crossed modules, homotopy 2-types, crossed complexes, higher dimensional algebra 
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Ronald Brown. Groupoids and crossed objects in algebraic topology. Homology, homotopy, and applications, Tome 1 (1999) no. 1, pp. 1-78. doi : 10.4310/HHA.1999.v1.n1.a1. http://geodesic.mathdoc.fr/articles/10.4310/HHA.1999.v1.n1.a1/

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