Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
4d4c0941be
This PR adds support for extensionality theorems (using the `[ext]` attribute) to the `grind` tactic. Users can disable this functionality using `grind -ext` . Below are examples that demonstrate problems now solvable by `grind`. ```lean open List in example : (replicate n a).map f = replicate n (f a) := by grind only [Option.map_some', Option.map_none', getElem?_map, getElem?_replicate] ``` ```lean @[ext] structure S where a : Nat b : Bool example (x y : S) : x.a = y.a → y.b = x.b → x = y := by grind ``` |
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