Special morphisms of groupoids.
Ivan, Gheorghe (2002)
Novi Sad Journal of Mathematics
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Displaying similar documents to “Cohomology groups of a groupoid.”
Special morphisms of groupoids.
A notion of open generalized morphism that carries amenability.
Buneci, Mădălina Roxana (2005)
Acta Universitatis Apulensis. Mathematics - Informatics
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On left distributive left idempotent groupoids
Přemysl Jedlička (2005)
Commentationes Mathematicae Universitatis Carolinae
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We study the groupoids satisfying both the left distributivity and the left idempotency laws. We show that they possess a canonical congruence admitting an idempotent groupoid as factor. This congruence gives a construction of left idempotent left distributive groupoids from left distributive idempotent groupoids and right constant groupoids.
Skew elements in -semigroups.
Petrescu, Adrian (2005)
Acta Universitatis Apulensis. Mathematics - Informatics
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Connections, local subgroupoids, and a holonomy Lie groupoid of a line bundle gerbe.
Brown, Ronald, Glazebrook, James F. (2003)
Zeszyty Naukowe Uniwersytetu Jagiellońskiego. Universitatis Iagellonicae Acta Mathematica
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Pointwise and global sums and negatives of binary relations.
Glavosits, Tamás, Száz, Árpád (2002)
Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică
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The minimal extension of sequences III. On problem 16 of Grätzer and Kisielewicz
J. Dudek (1996)
Colloquium Mathematicae
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The main result of this paper is a description of totally commutative idempotent groupoids. In particular, we show that if an idempotent groupoid (G,·) has precisely m ≥ 2 distinct essentially binary polynomials and they are all commutative, then G contains a subgroupoid isomorphic to the groupoid described below. In [2], this fact was proved for m = 2.
Crossed complexes, and free crossed resolutions for amalgamated sums and HNN-extensions of groups.
Brown, R., Moore, E.J., Porter, T., Wensley, C.D. (2002)
Georgian Mathematical Journal
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An introduction to gerbes on orbifolds
Ernesto Lupercio, Bernardo Uribe (2004)
Annales mathématiques Blaise Pascal
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This paper is a gentle introduction to some recent results involving the theory of gerbes over orbifolds for topologists, geometers and physicists. We introduce gerbes on manifolds, orbifolds, the Dixmier-Douady class, Beilinson-Deligne orbifold cohomology, Cheeger-Simons orbifold cohomology and string connections.