Relating first-order set theories and elementary toposes

Bulletin of Symbolic Logic 13 (3):340-358 (2007)
Abstract
We show how to interpret the language of first-order set theory in an elementary topos endowed with, as extra structure, a directed structural system of inclusions (dssi). As our main result, we obtain a complete axiomatization of the intuitionistic set theory validated by all such interpretations. Since every elementary topos is equivalent to one carrying a dssi, we thus obtain a first-order set theory whose associated categories of sets are exactly the elementary toposes. In addition, we show that the full axiom of Separation is validated whenever the dssi is superdirected. This gives a uniform explanation for the known facts that cocomplete and realizability toposes provide models for Intuitionistic Zermelo—Fraenkel set theory (IZF)
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Nathanael Leedom Ackerman (2010). Relativized Grothendieck topoi. Annals of Pure and Applied Logic 161 (10):1299-1312.
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