* [HoTT] New preprint : A model of Martin-Löf extensional type theory with universes formalized in Agda ( arXiv:1909.01414)
@ 2019-09-05 7:10 Erik Palmgren
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From: Erik Palmgren @ 2019-09-05 7:10 UTC (permalink / raw)
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From type theory to setoids and back
(Submitted on 3 Sep 2019)
A model of Martin-Löf extensional type theory with universes is formalized in Agda, an interactive proof system based on Martin-Löf intensional type theory. This may be understood, we claim, as a solution to the old problem of modelling the full extensional theory in the intensional theory. Types are interpreted as setoids, and the model is therefore a setoid model. We solve the problem of intepreting type universes by utilizing Aczel's type of iterative sets, and show how it can be made into a setoid of small setoids containing the necessary setoid constructions.
In addition we interpret the bracket types of Awodey and Bauer. Further quotient types should be interpretable.
Comments: 30 pages
Subjects: Logic (math.LO)
MSC classes: 03B15, 03B35, 03E70, 03F50
Cite as: arXiv:1909.01414<https://arxiv.org/abs/1909.01414> [math.LO]
(or arXiv:1909.01414v1<https://arxiv.org/abs/1909.01414v1> [math.LO] for this version)
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2019-09-05 7:10 [HoTT] New preprint : A model of Martin-Löf extensional type theory with universes formalized in Agda ( arXiv:1909.01414) Erik Palmgren
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