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Double groupoid

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Algebra Abstract algebra Algebraic structures
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A double groupoid is a mathematical structure that generalizes the concept of a groupoid. To understand what a double groupoid is, it helps to first clarify what a groupoid is. ### Groupoid A **groupoid** consists of a set of objects and a set of morphisms (arrows) between these objects satisfying certain axioms. Specifically: - Each morphism has a source and target object.

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