18 citations · 19 across the 4 of their papers we have counts for
4 papers
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…
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…
Free crossed resolutions from simplicial resolutions with given CW-basis
A Mutlu, T Porter
In this paper, we examine the relationship between a CW-basis for a free simplicial group and methods of freely generating the corresponding crossed complex. Attention is concentra…
Joins for (Augmented) Simplicial Sets
P. J. Ehlers, T. Porter
We introduce a notion of join for (augmented) simplicial sets generalising the classical join of geometric simplicial complexes. The definition comes naturally from the ordinal sum…