Closure operators, monomorphisms and epimorphisms in categories of groups
Gabriele Castellini (1986)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Displaying similar documents to “A useful category for mixed Abelian groups.”
Closure operators, monomorphisms and epimorphisms in categories of groups
Exact couples in a Raïkov semi-abelian category
Yaroslav Kopylov (2004)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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A homological algebra for valuated groups
Temple H. Fay (1981)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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An orthogonal theory of a set-valued bifunctor
Pavel Jambor (1973)
Czechoslovak Mathematical Journal
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The two-square lemma.
Temple H. Fay, Keith A. Hardie, Peter J. Hilton (1989)
Publicacions Matemàtiques
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A new proof is given of the connecting homomorphism.
Injectives in arrow categories
Hiller, Howard (1977)
Portugaliae mathematica
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Spaces associated to quadratic endofunctors of the category of groups.
Hans-Joachim Baues, Teimuraz Pirashvili (2005)
Extracta Mathematicae
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Square groups are gadgets classifying quadratic endofunctors of the category of groups. Applying such a functor to the Kan simplicial loop group of the 2-dimensional sphere, one obtains a one-connected three-type. We consider the problem of characterization of those three-types X which can be obtained in this way. We solve this problem in some cases, including the case when π(X) is a finitely generated abelian group. The corresponding stable problem is solved completely.