2 commits

Author	SHA1	Message	Date
Leonardo de Moura	0173444d24	feat: heterogeneous contructor injectivity in grind (#11491) ... This PR implements heterogeneous contructor injectivity in `grind`. Example: ```lean opaque double : Nat → Nat inductive Parity : Nat -> Type | even (n) : Parity (double n) | odd (n) : Parity (Nat.succ (double n)) opaque q : Nat → Nat → Prop axiom qax : q a b → double a = double b attribute [grind →] qax example (motive : (x : Nat) → Parity x → Sort u_1) (h_2 : (j : Nat) → motive (double j) (Parity.even j)) (j n : Nat) (heq_1 : q j n) -- Implies that `double j = double n` (heq_2 : Parity.even n ≍ Parity.even j): h_2 n ≍ h_2 j := by grind ``` Closes #11449	2025-12-03 04:01:19 +00:00
Joachim Breitner	edf804c70f	feat: heterogeneous noConfusion (#11474) ... This PR generalizes the `noConfusion` constructions to heterogeneous equalities (assuming propositional equalities between the indices). This lays ground work for better support for applying injection to heterogeneous equalities in grind. The `Meta.mkNoConfusion` app builder shields most of the code from these changes. Since the per-constructor noConfusion principles are now more expressive, `Meta.mkNoConfusion` no longer uses the general one. In `Init.Prelude` some proofs are more pedestrian because `injection` now needs a bit more machinery. This is a breaking change for whoever uses the `noConfusion` principle manually and explicitly for a type with indices. Fixes #11450.	2025-12-02 15:19:47 +00:00