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Toposes of group actions

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A group homomorphism from G to H in a topos induces a geometric morphism between the corresponding toposes of G-objects and H-objects. I will give a necessary and sufficient condition for that geometric morphism to be a local homeomorphism and I will give an interpretation of the result by applying it to a specific geometric morphism of classifying toposes.

This talk is part of the Junior Category Theory Seminar series.

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