Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
1cd6db1579
This PR implements support for auto-generated congruence theorems in `Sym.simp`, enabling simplification of functions with complex argument dependencies such as proof arguments and `Decidable` instances. Previously, `Sym.simp` used basic congruence lemmas (`congrArg`, `congrFun`, `congrFun'`, `congr`) to construct proofs when simplifying function arguments. This approach is efficient for simple cases but cannot handle functions with dependent proof arguments or `Decidable` instances that depend on earlier arguments. The new `congrThm` function applies pre-generated congruence theorems (similar to the main simplifier) to handle these complex cases. |
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