Geodesic
Pullback and finite coproduct preserving functors between categories of permutation representations
Theory and applications of categories, Tome 16 (2006), pp. 771-784.

Voir la notice de l'article provenant de la source Theory and Applications of Categories website

Motivated by applications to Mackey functors, Serge Bouc characterized pullback and finite coproduct preserving functors between categories of permutation representations of finite groups. Initially surprising to a category theorist, this result does have a categorical explanation which we provide.
Classification : 58A03, 18A30
Keywords: topos, permutation representations, limits and colimits, adjunction, Mackey functors 
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     title = {Pullback and finite coproduct preserving functors between categories of permutation representations},
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Elango Panchadcharam; Ross Street. Pullback and finite coproduct preserving functors between categories of permutation representations. Theory and applications of categories, Tome 16 (2006), pp. 771-784. http://geodesic.mathdoc.fr/item/TAC_2006_16_a27/