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(* File reduced by coq-bug-finder from original input, then from 8808 lines to 424 lines, then from 432 lines to 196 lines, then from\
145 lines to 82 lines *)
(* coqc version trunk (September 2014) compiled on Sep 18 2014 21:0:5 with OCaml 4.01.0
coqtop version cagnode16:/afs/csail.mit.edu/u/j/jgross/coq-trunk,trunk (07e4438bd758c2ced8caf09a6961ccd77d84e42b) *)
Reserved Infix "o" (at level 40, left associativity).
Global Set Primitive Projections.
Delimit Scope morphism_scope with morphism.
Delimit Scope category_scope with category.
Delimit Scope object_scope with object.
Record PreCategory :=
{ object :> Type;
morphism : object -> object -> Type;
identity : forall x, morphism x x;
compose : forall s d d',
morphism d d'
-> morphism s d
-> morphism s d'
where "f 'o' g" := (compose f g)
}.
Arguments identity {!C%category} / x%object : rename.
Infix "o" := (@compose _ _ _ _) : morphism_scope.
Local Open Scope morphism_scope.
Definition prodC (C D : PreCategory) : PreCategory.
refine (@Build_PreCategory
(C * D)%type
(fun s d => (morphism C (fst s) (fst d)
* morphism D (snd s) (snd d))%type)
(fun x => (identity (fst x), identity (snd x)))
(fun s d d' m2 m1 => (fst m2 o fst m1, snd m2 o snd m1))).
Defined.
Local Infix "*" := prodC : category_scope.
Delimit Scope functor_scope with functor.
Record Functor (C D : PreCategory) :=
{
object_of :> C -> D;
morphism_of : forall s d, morphism C s d
-> morphism D (object_of s) (object_of d);
identity_of : forall x, morphism_of _ _ (identity x)
= identity (object_of x)
}.
Arguments morphism_of [C%category] [D%category] F%functor [s%object d%object] m%morphism : rename, simpl nomatch.
Notation "F '_1' m" := (morphism_of F m) (at level 10, no associativity) : morphism_scope.
Axiom cheat : forall {A}, A.
Record NaturalTransformation C D (F G : Functor C D) := { components_of :> forall c, morphism D (F c) (G c) }.
Definition functor_category (C D : PreCategory) : PreCategory.
exact (@Build_PreCategory (Functor C D)
(@NaturalTransformation C D) cheat cheat).
Defined.
Local Notation "C -> D" := (functor_category C D) : category_scope.
Variable C1 : PreCategory.
Variable C2 : PreCategory.
Variable D : PreCategory.
Definition functor_object_of
: (C1 -> (C2 -> D))%category -> (C1 * C2 -> D)%category.
Proof.
intro F; hnf in F |- *.
refine (Build_Functor
(prodC C1 C2) D
(fun c1c2 => F (fst c1c2) (snd c1c2))
(fun s d m => F (fst d) _1 (snd m) o (@morphism_of _ _ F _ _ (fst m)) (snd s))
_).
intros.
rewrite identity_of.
cbn.
rewrite (identity_of _ _ F (fst x)).
Undo.
(* Toplevel input, characters 20-55:
Error:
Found no subterm matching "F _1 (identity (fst x))" in the current goal. *)
rewrite identity_of. (* Toplevel input, characters 15-34:
Error:
Found no subterm matching "morphism_of ?202 (identity ?203)" in the current goal. *)
Abort.
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