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8 votes
1 answer
789 views

Easier Girard's paradox in a circular pure type system (PTS)

System U is an inconsistent PTS in that one has a term of type $\bot = \forall p\colon \ast \ldotp p$, and such a term is explicitly constructed in Hurkens' A Simplification of Girard's Paradox. One- …
H Koba's user avatar
  • 369
5 votes
1 answer
921 views

New foundation in homotopy type theory

Is there any model of NF (New Foundations) on HoTT (homotopy type theory)? Because there is a model of ZF(C) on HoTT (The HoTT book, Section 10.5) and NF on ZFC (by this Wikipedia articile), I think …
H Koba's user avatar
  • 369