2 papers
math.AT2004
A homotopy double groupoid of a Hausdorff space II: a van Kampen theorem
R. Brown, H. K. Kamps, T. Porter
This paper is the second in a series exploring the properties of a functor which assigns a homotopy double groupoid with connections to a Hausdorff space. We show that this functor…
math.AT2002
Crossed complexes, and free crossed resolutions for amalgamated sums and HNN-extensions of groups
Ronald Brown, Emma J. Moore, Timothy Porter +1
The category of crossed complexes gives an algebraic model of CW-complexes and cellular maps. Free crossed resolutions of groups contain information on a presentation of the group…