Leonardo de Moura 769220fa4e fix(library/equations_compiler): structural recursion and partial equations ... The equational compiler was failing to generate equational lemmas for equations such as: def f : nat → nat → nat | (x+1) (y+1) := f (x+10) y | _ _ := 1 It would fail when trying to prove the following equation: forall x, f 0 x = 1 using a "refl" proof. This equation does not hold definitionally. It is not blocked by the internal pattern matching based on the cases_on recursor, but it is blocked by the outer most brec_on used to implement structural recursion. The solution is to "complete" the set of equations. So, the structural_rec module will replace the equation above with def f : nat → nat → nat | (x+1) (y+1) := f (x+10) y | _ 0 := 1 | _ (y+1) := 1 and then (as before) def f : Pi (x y : nat), below y → nat | (x+1) (y+1) F := F^.fst^.fst (x+10) | _ 0 F := 1 | _ (y+1) F := 1		2017-02-16 14:51:31 -08:00
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lean	fix(library/equations_compiler): structural recursion and partial equations	2017-02-16 14:51:31 -08:00
.gitignore	refactor(gitignore): remove old ignore entries	2016-12-10 08:42:39 -08:00