fix(library/data/category): minor problem that was being masked by bug #182, fixes #183

2014-09-11 16:58:32 -07:00 · 2014-09-11 16:58:32 -07:00 · c8e20ff3c0
commit c8e20ff3c0
parent 7f1977694f
1 changed files with 11 additions and 11 deletions
--- a/library/data/category.lean
+++ b/library/data/category.lean
@ -43,7 +43,7 @@ namespace category
  theorem id_left  : Π {A B : ob} {f : mor A B}, id ∘ f = f :=
  rec (λ mor comp id assoc idr idl, idl) Cat

-  theorem id_compose : (ID A) ∘ id = id :=
+  theorem id_compose {A : ob} : (ID A) ∘ id = id :=
  id_left

  theorem left_id_unique (i : mor A A) (H : Π{B} {f : mor B A}, i ∘ f = f) : i = id :=