A minimalist two-level foundation for constructive mathematics

Details A minimalist two-level foundation for constructive mathematics A minimalist two-level foundation for constructive mathematics

2008-11-17

arxiv.org/abs/0811.2774v3

Mathematics

Logic

46 pages, revised version (I corrected typos)

Scientific paper

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 the set-theoretic version introduced in the mentioned paper with collections. The other level is given by an extensional set theory which 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.

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