Internal presheaves toposes
Marta Bunge (1977)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Displaying similar documents to “When is a cogenerator in a topos ?”
Internal presheaves toposes
On product and change of base for toposes
Andrews Pitts (1985)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Bounded functors, finite limits and an application of injective topoi
Robert Rosebrugh (1983)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Stack completions and Morita equivalence for categories in a topos
Marta Bunge (1979)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Stacks and equivalence of indexed categories
Marta Bunge, Robert Pare (1979)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Initial normal covers in bi-Heyting toposes
Francis Borceux, Dominique Bourn, Peter Johnstone (2006)
Archivum Mathematicum
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The dual of the category of pointed objects of a topos is semi-abelian, thus is provided with a notion of semi-direct product and a corresponding notion of action. In this paper, we study various conditions for representability of these actions. First, we show this to be equivalent to the existence of initial normal covers in the category of pointed objects of the topos. For Grothendieck toposes, actions are representable provided the topos admits an essential Boolean covering. This...