Central extensions in semi-abelian categories

Semi-abelian categories

George Janelidze, L. Márki, Walter Tholen · Journal of Pure and Applied Algebra · 2002 · 478 citations

G-groupoids, crossed modules and the fundamental groupoid of a topological group

Ronald Brown, Christopher B. Spencer · Indagationes Mathematicae (Proceedings) · 1976 · 224 citations

Natural Sciences, Mathematics, Geometry +12

Groups with Multiple Operators

Paul Higgins · Proceedings of the London Mathematical Society · 1956 · 212 citations

Natural Sciences, Mathematics, Algebra +9

Diagram chasing in Mal'cev categories

A. Carboni, J. Lambek, Maria Cristina Pedicchio · Journal of Pure and Applied Algebra · 1991 · 190 citations

Architecture, Architectural Representation, Diagramming +7

Some remarks on Maltsev and Goursat categories

A. Carboni, G. M. Kelly, Maria Cristina Pedicchio · Applied Categorical Structures · 1993 · 163 citations

Natural Sciences, Mathematics, Algebra +7