Geodesic
More on geometric morphisms between realizability toposes
Theory and applications of categories, Tome 29 (2014), pp. 874-895.

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Geometric morphisms between realizability toposes are studied in terms of morphisms between partial combinatory algebras (pcas). The morphisms inducing geometric morphisms (the computationally dense ones) are seen to be the ones whose `lifts' to a kind of completion have right adjoints. We characterize topos inclusions corresponding to a general form of relative computability. We characterize pcas whose realizability topos admits a geometric morphism to the effective topos.
Publié le :
Classification : 18B25, 03D75
Keywords: realizability toposes, partial combinatory algebras, geometric morphisms, local operators 
@article{TAC_2014_29_a29,
     author = {Eric Faber and Jaap van Oosten},
     title = {More on geometric morphisms between realizability toposes},
     journal = {Theory and applications of categories},
     pages = {874--895},
     publisher = {mathdoc},
     volume = {29},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2014_29_a29/}
}
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Eric Faber; Jaap van Oosten. More on geometric morphisms between realizability toposes. Theory and applications of categories, Tome 29 (2014), pp. 874-895. http://geodesic.mathdoc.fr/item/TAC_2014_29_a29/