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Jul 23, 2020 at 14:15 comment added Ronnie Brown The questioner could also find the following helpful on the use of crossed modules. 1. "Groupoids and crossed objects in algebraic topology"Homology, Homotopy Applications, 1(1999) 1-78, and the book "Nonabelian Algebrqic Topology, both downloadable from my wen site. The uses suggest the kind of classification one seeks. .
Jul 18, 2020 at 11:57 review First posts
Jul 18, 2020 at 12:52
Jul 18, 2020 at 11:57 history answered ChrisWensley CC BY-SA 4.0