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#	Item
81	Journal of Homotopy and Related Structures, vol. 1(1), 2006, pp.175–183 GROUPOIDS, THE PHRAGMEN-BROUWER PROPERTY, AND THE JORDAN CURVE THEOREM RONALD BROWN (communicated by Frederick Cohen) Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2007-12-16 10:48:42 Mathematics Seifert–van Kampen theorem Groupoid Covering space Fundamental group Pushout Group action Path Jordan curve theorem Abstract algebra Topology Homotopy theory
82	Groups, groupoids and higher groupoids in algebraic topology An area of mathematics in which nonabelian structures have proved important is algebraic topology, where the fundamental group π1 (X, a) of a space X at a bas Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2010-12-20 11:50:11 Homotopy theory Category theory Higher category theory Algebraic topology Algebraic structures Double groupoid Seifert–van Kampen theorem Higher-dimensional algebra Homotopy group Abstract algebra Topology Mathematics
83	Homotopy theory, and change of base for groupoids and multiple groupoids∗† Ronald Brown March 6, 2007 Abstract Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2007-03-06 17:03:14 Homotopy theory Category theory Higher category theory Algebraic topology Algebraic structures Double groupoid Groupoid Seifert–van Kampen theorem Crossed module Abstract algebra Mathematics Topology
84	Graphs of Groups: Word Computations and Free Crossed Resolutions Emma Jane Moore November 2000 Summary Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-03-17 08:32:10 Homotopy theory Algebraic topology Category theory Geometric group theory Algebraic structures Groupoid Crossed module Fundamental group Graph of groups Abstract algebra Mathematics Algebra
85	ALGEBRAIC COLIMIT CALCULATIONS IN HOMOTOPY THEORY USING FIBRED AND COFIBRED CATEGORIES RONALD BROWN AND RAFAEL SIVERA Abstract. Higher Homotopy van Kampen Theorems allow some colimit calculations of certain homotopical i Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2009-04-24 09:00:50 Fibred category Universal property Limit Adjoint functors Functor Cone Sheaf Coproduct Groupoid Category theory Abstract algebra Mathematics
86	Homology, Homotopy and Applications, vol. 10(1), 2008, pp.1–17 A NEW HIGHER HOMOTOPY GROUPOID: THE FUNDAMENTAL GLOBULAR ω-GROUPOID OF A FILTERED SPACE RONALD BROWN Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-03-29 17:33:10 Mathematics Seifert–van Kampen theorem Crossed module Groupoid Homotopy group Hurewicz theorem Ronald Brown 2-group Fundamental group Abstract algebra Topology Homotopy theory
87	Journal of Homotopy and Related Structures, vol. 1(1), 2006, pp.1–12 EXACT SEQUENCES OF FIBRATIONS OF CROSSED COMPLEXES, HOMOTOPY CLASSIFICATION OF MAPS, AND NONABELIAN EXTENSIONS OF GROUPS Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-06-25 03:44:35 Algebraic topology Category theory Homology theory Crossed module Groupoid Homotopy group Model category Weak equivalence Homotopy lifting property Topology Homotopy theory Abstract algebra
88	Homology, Homotopy and Applications, vol. 10(1), 2008, pp.327–343 A NEW HIGHER HOMOTOPY GROUPOID: Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-04-19 01:30:31 Mathematics Seifert–van Kampen theorem Crossed module Groupoid Homotopy group Hurewicz theorem Ronald Brown 2-group Fundamental group Abstract algebra Topology Homotopy theory
89	Some Context for Higher Dimensional Group Theory Brandt’s Gauss’ Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2004-04-13 12:22:35 Homotopy theory Algebraic structures Mathematics Algebra Groupoid Languages of Germany Latin alphabets Abstract algebra Category theory
90	ON THE CONNECTION BETWEEN THE SECOND RELATIVE HOMOTOPY GROUPS OF SOME RELATED SPACES Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-03-06 07:26:59 Mathematics Groupoid Homotopy group Double groupoid Crossed module Fundamental group Homotopy Group action Path Abstract algebra Homotopy theory Topology

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