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Ronald Brown
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101	HOMOTOPICAL EXCISION, AND HUREWICZ THEOREMS, FOR n-CUBES OF SPACES ∗ Ronald Brown and Jean-Louis Loday Introduction The fact that the relative homotopy groups do not satisfy excision makes the computation of absolute h Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2006-12-24 10:28:00 Algebraic topology Homology theory Hurewicz theorem Homotopy group Category theory Crossed module Fundamental group Functor Seifert–van Kampen theorem Abstract algebra Topology Homotopy theory
102	A MODEL STRUCTURE FOR THE HOMOTOPY THEORY OF CROSSED COMPLEXES Ronald BROWN and Marek GOLASINSKI∗ Abstract ` des complexes de chaˆıne mais avec les propri´et´es nonLes complexes crois´es sont analogues a Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2007-05-28 06:24:21 Mathematics Category theory Model category Groupoid Crossed module Weak equivalence Homotopy group Fibration Fibrant object Homotopy theory Abstract algebra Topology
103	COVERING GROUPS OF NON-CONNECTED TOPOLOGICAL GROUPS REVISITED Ronald Brown and Osman Mucuk School of Mathematics University of Wales Bangor, Gwynedd LL57 1UT, U.K. Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2006-12-18 10:25:20 Category theory Homotopy theory Algebraic topology Algebraic structures Symmetry Groupoid Lie groupoid Group action Double groupoid Abstract algebra Mathematics Algebra
104	COMPUTING HOMOTOPY TYPES USING CROSSED N -CUBES OF GROUPS∗ Ronald Brown University of Wales, Bangor Gwynedd LL57 1UT, U.K. Dedicated to the memory of Frank Adams Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2006-08-12 17:58:10 Mathematics Algebraic topology Category theory Higher category theory Algebraic structures Crossed module Homotopy group Seifert–van Kampen theorem Double groupoid Abstract algebra Topology Homotopy theory
105	Crossed complexes and chain complexes with operators∗ by RONALD BROWN School of Mathematics, University College of North Wales, Bangor, Gwynedd LL57 1UT PHILIP J. HIGGINS Department of Mathematical Sciences, University Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2008-04-04 03:58:11 Homotopy theory Category theory Algebraic topology Group theory Group actions Groupoid Category Adjoint functors Crossed module Abstract algebra Algebra Mathematics
106	ON THE SCHREIER THEORY OF NONABELIAN EXTENSIONS: GENERALISATIONS AND COMPUTATIONS Ronald Brown and Timothy Porter School of Mathematics University of Wales, Bangor Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2003-03-19 12:46:48 Homological algebra Algebraic topology Group theory Morphisms Crossed module Epimorphism G-module Kernel Image Abstract algebra Algebra Category theory
107	Groupoids and crossed objects in algebraic topology Ronald Brown∗ School of Computer Science Bangor University United Kingdom October 23, 2011 Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2011-10-23 12:37:46 Homotopy theory Category theory Higher category theory Algebraic topology Algebraic structures Groupoid Double groupoid Seifert–van Kampen theorem Group action Abstract algebra Mathematics Algebra
108	FROM GROUPS TO GROUPOIDS: A BRIEF SURVEY ∗ RONALD BROWN Bull. London Math. Soc[removed][removed] Add to Reading List Source URL: pages.bangor.ac.uk Language: English - Date: 2012-04-02 11:09:15 Homotopy theory Category theory Algebraic topology Group theory Higher category theory Groupoid Seifert–van Kampen theorem Double groupoid Group action Abstract algebra Mathematics Algebra
109	A Robot Supervision Architecture for Safe and Efficient Space Exploration and Operation Ehud Halberstam, Luis Navarro-Serment, Ronald Conescu, Sandra Mau, Gregg Podnar, Alan D. Guisewite, H. Benjamin Brown, Alberto Elfes Add to Reading List Source URL: www.cs.cmu.edu Language: English - Date: 2005-12-23 15:48:22 Human–robot interaction Autonomous robot Cognitive robotics Technology Artificial intelligence Science Robotics Telepresence Robot
110	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

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