Double groupoid

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21	FROM GROUPS TO GROUPOIDS: A BRIEF SURVEY ∗ RONALD BROWN 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
22	Theory and Applications of Categories, Vol. 14, No. 9, 2005, pp. 200–220. A HOMOTOPY DOUBLE GROUPOID OF A HAUSDORFF SPACE II: Add to Reading List Source URL: www.emis.de Language: English - Date: 2005-06-19 12:29:32 Category theory Higher category theory Algebraic topology Algebraic structures Double groupoid Seifert–van Kampen theorem Groupoid Homotopy group Directed algebraic topology Abstract algebra Homotopy theory Mathematics