Homology, Homotopy and Applications
Volume 9 (2007)
Notes on 2-groupoids, 2-groups and crossed modules
Pages: 75 – 106
This paper contains some basic results on 2-groupoids, with special emphasis on computing derived mapping 2-groupoids between 2-groupoids and proving their invariance under strictification. Some of the results proven here are presumably folklore (but do not appear in the literature to the author’s knowledge) and some of the results seem to be new. The main technical tool used throughout the paper is the Quillen model structure on the category of 2-groupoids introduced by Moerdijk and Svensson.
homology, homotopy, 2-group, 2-groupoid, crossed module, 2-type, lax 2-functors, weak 2-functors
2010 Mathematics Subject Classification
18D05, 18G50, 55U40
Published 1 January 2007
An earlier version of this article was made available online on November 23, 2006.