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Two proofs of the exponentiability of perfect maps are presented and compared to two other recent approaches. One of the proofs is an elementaryapproach including a direct construction of the exponentials. The other, implicit in the literature, uses internal locales in the topos of set-valued sheaves on a topological space.
@article{TAC_2002_10_a4, author = {Susan Niefield}, title = {Exponentiability of perfect maps: four approaches}, journal = {Theory and applications of categories}, pages = {127--133}, publisher = {mathdoc}, volume = {10}, year = {2002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2002_10_a4/} }
Susan Niefield. Exponentiability of perfect maps: four approaches. Theory and applications of categories, Tome 10 (2002), pp. 127-133. http://geodesic.mathdoc.fr/item/TAC_2002_10_a4/