scientific article; zbMATH DE number 5934757
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Publication:5200285
zbMath1239.18012MaRDI QIDQ5200285
Publication date: 1 August 2011
Full work available at URL: http://www.emis.de/journals/TAC/volumes/24/17/24-17abs.html
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torsorMal'tsev categorycentraliserinternal groupoidprofunctorSchreier-Mac Lane extension theoremcategorical Galois theorynon-abelian extensionsintrinsic commutator theory
Nonabelian homological algebra (category-theoretic aspects) (18G50) Categories of algebras (08C05) Category of groups (20J15) Groupoids, semigroupoids, semigroups, groups (viewed as categories) (18B40)
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Extension theory and the calculus of butterflies ⋮ Profunctors in Mal'tsev categories and fractions of functors ⋮ The third cohomology group of a monoid and admissible abstract kernels ⋮ On the classification of Schreier extensions of monoids with non-abelian kernel ⋮ Butterflies in a semi-abelian context ⋮ Obstruction theory in action accessible categories ⋮ A push forward construction and the comprehensive factorization for internal crossed modules ⋮ Unnamed Item ⋮ Fibred-categorical obstruction theory
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