Parametricity, Automorphisms of the Universe, and Excluded Middle

Autor: Booij, Auke B., Escardó, Martín H., Lumsdaine, Peter LeFanu, Shulman, Michael
Jazyk: angličtina
Rok vydání: 2018
Předmět:
DOI: 10.4230/lipics.types.2016.7
Popis: It is known that one can construct non-parametric functions by assuming classical axioms. Our work is a converse to that: we prove classical axioms in dependent type theory assuming specific instances of non-parametricity. We also address the interaction between classical axioms and the existence of automorphisms of a type universe. We work over intensional Martin-Löf dependent type theory, and for some results assume further principles including function extensionality, propositional extensionality, propositional truncation, and the univalence axiom.
Databáze: OpenAIRE