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Date: 2007-03-15 03:52:40Homotopy theory Category theory Higher category theory Algebraic structures Differential geometry Double groupoid Groupoid Lie groupoid Crossed module Abstract algebra Mathematics Algebra | ARTICLE IN PRESS Advances in Mathematics[removed]–175 http://www.elsevier.com/locate/aimAdd to Reading ListSource URL: pages.bangor.ac.ukDownload Document from Source WebsiteFile Size: 321,37 KBShare Document on Facebook |