10 citations · 11 across the 3 of their papers we have counts for
4 papers
Nonabelian Algebraic Topology
Ronald Brown
This talk gave a sketch of the contents and background to a book with the title `Nonabelian algebraic topology' being written under support of a Leverhulme Emeritus Fellowship (200…
Towards non commutative algebraic topology
Ronald Brown
This is a slightly edited version of the transparencies for a seminar at UCL, May 7, 2003. It is intended to give a quick view of background, ideas, and some calculations, in the a…
The fundamental groupoid of the quotient of a Hausdorff space by a discontinuous action of a discrete group is the orbit groupoid of the induced action
Ronald Brown, Philip J. Higgins
The main result is that the fundamental groupoid of the orbit space of a discontinuous action of a discrete group on a Hausdorff space which admits a universal cover is the orbit g…
Computing Homotopy Types Using Crossed N-Cubes of Groups
Ronald Brown
The aim of this paper is to explain how, through the work of a number of people, some algebraic structures related to groupoids have yielded algebraic descriptions of homotopy n-ty…