Groupoids and the Mayer-Vietoris sequence

Elements of Modern Topology.

John D. Baum, Ronald Brown · American Mathematical Monthly · 1969 · 176 citations

Natural Sciences, Computer Science, Mathematics +10

Colimit theorems for relative homotopy groups

Ronald Brown, Philip J. Higgins · Journal of Pure and Applied Algebra · 1981 · 138 citations

Natural Sciences, Evolutionary Biology, Topology +8

Groupoids and Van Kampen's Theorem

Ronald Brown · Proceedings of the London Mathematical Society · 1967 · 91 citations

Natural Sciences, Mathematics, Geometry +7

Fibrations of groupoids

Ronald Brown · Journal of Algebra · 1970 · 90 citations

Product formulae for Nielsen numbers of fibre maps

Philip R. Heath · Pacific Journal of Mathematics · 1985 · 51 citations · Full text

Natural Sciences, Mathematics, Combinatorics +6