Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
the internal constructions for structural and well-founded recursion use plenty of `PProd` and `MProd`, and reading these, deeply nested and in prefix notation, is unnecessarily troublesome. Therefore this introduces notations ``` a ×ₚ b -- PProd a b a ×ₘ b -- MProd a b ()ₚ -- PUnit.unit (x,y,z)ₚ -- PProd.mk x (PProd.mk y z) (x,y,z)ₘ -- MProd.mk x (MProd.mk y z) ``` (This is part 1, the rest will follow in #4730 after a stage0 update.) |
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This is the repository for Lean 4.
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