Brandt groupoid

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Groupoid — dablink|This article is about groupoids in category theory. For the algebraic structure with a single binary operation see magma (algebra). In mathematics, especially in category theory and homotopy theory, a groupoid is a simultaneous… … Wikipedia
Double groupoid — In mathematics, especially in higher dimensional algebra and homotopy theory, a double groupoid generalises the notion of groupoid and of category to a higher dimension. Contents 1 Definition 2 Convolution algebra 3 Double Groupoid Category … Wikipedia
Heinrich Brandt — (8 November 1886, Feudingen 9 OCtober 1954, Halle, Saxony Anhalt) was a German mathematician who was the first to develop the concept of groupoid.Brandt studied at the University of Göttingen and, from 1910 to 1913, at the University of… … Wikipedia
Higher-dimensional algebra — This article is about higher dimensional algebra and supercategories, respectively, in generalized category theory, and supercategory theory or meta mathematics .In higher dimensional algebra [cite journal|last = Batanin|first = MA|title =… … Wikipedia
Inverse semigroup — In mathematics, an inverse semigroup S is a semigroup in which every element x in S has a unique inverse y in S in the sense that x = xyx and y = yxy. Inverse semigroups appear in a range of contexts; for example, they can be employed in the… … Wikipedia

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