A minimalist two-level foundation for constructive mathematics

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Abstract

We present a two-level theory to formalize constructive mathematics as advocated in a previous paper with G. Sambin. One level is given by an intensional type theory, called Minimal type theory. This theory extends a previous version with collections. The other level is given by an extensional set theory that is interpreted in the first one by means of a quotient model. This two-level theory has two main features: it is minimal among the most relevant foundations for constructive mathematics; it is constructive thanks to the way the extensional level is linked to the intensional one which fulfills the "proofs-as-programs" paradigm and acts as a programming language. © 2009 Elsevier B.V. All rights reserved.

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Maietti, M. E. (2009). A minimalist two-level foundation for constructive mathematics. Annals of Pure and Applied Logic, 160(3), 319–354. https://doi.org/10.1016/j.apal.2009.01.006

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