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Paper detail

Game semantics of universes

This work extends the present author's computational game semantics of Martin-Löf type theory to the cumulative hierarchy of universes. This extension completes game semantics of all standard types of Martin-Löf type theory for the first time in the 30 years history of modern game semantics. As a result, the powerful combinatorial reasoning of game semantics becomes available for the study of universes and types generated by them. A main challenge in achieving game semantics of universes comes from a conflict between identity types and universes: Naive game semantics of the encoding of an identity type by a universe induces a decision procedure on the equality between functions, a contradiction to a well-known fact in recursion theory. We overcome this problem by novel games for universes that encode games for identity types without deciding the equality.

preprint2022arXivOpen access
Norihiro Yamada
Logic in Computer Sciencemath.COmath.LO
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Norihiro Yamada

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