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On categories with semidirect products - MaRDI portal

On categories with semidirect products (Q456874)

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scientific article; zbMATH DE number 6094158
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On categories with semidirect products
scientific article; zbMATH DE number 6094158

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    On categories with semidirect products (English)
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    16 October 2012
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    In this paper, necessary and sufficient conditions for a pointed category to admid semidirect products in the sense of \textit{D. Bourn} and \textit{G. Janelidze} [Theory Appl. Categ. 4, 37--46 (1998; Zbl 0890.18003) are given and interpreted in exactness of appropriate split extensions. In the cited reference [loc. cit.], the categorical notion of semidirect product in a category was introduced generalizing the notion of semidirect product of groups. By Theorem 3.4 in [loc. cit.] semi-abelian categories admits semidirect products but semi-abelianess is not a necessary condition for the existence of semidirect productdirectness.
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    semidirect product
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    semi-abelian categories
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    internal action
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