Algebraic Models of Intuitionistic Theories of Sets and Classes

Abstract

This paper constructs models of intuitionistic set theory in suitable categories. First, a Basic Intuitionistic Set Theory (BIST) is stated, and the categorical semantics are given. Second, we give a notion of an ideal over a category, using which one can build a model of BIST in which a given topos occurs as the sets. And third, a sheaf model is given of a Basic Intuitionistic Class Theory conservatively extending BIST. The paper extends the results in [2] by introducing a new and perhaps more natural notion of ideal, and in the class theory of part three

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2010-09-14

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Steve Awodey
Carnegie Mellon University

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