Section eq. Let A := { X : Type & X }. Let B := (fun x : A => projT1 x). Let T := (fun (a' : A) (b' : B a') => projT2 a' = b'). Let T' := T. Let t1T := (fun _ : A => unit). Let f1 := (fun x (_ : t1T x) => projT2 x). Let t1 := (fun x (y : t1T x) => @eq_refl (projT1 x) (projT2 x)). Let t1T' := t1T. Let f1' := f1. Let t1' := t1.
Theorem eq_matches_commute
a' b' (t' : T a' b')
(rta : forall b'', T' a' b'' -> A)
(rtb : forall b'' t'', B (rta b'' t''))
(rt1 : forall y, T _ (rtb (f1' a' y) (@t1' a' y)))
(R : forall (b : B (rta b' t')), T _ b -> Type)
(r1 : forall y, R (f1 _ y) (@t1 _ y))
: match match t' as t0' in (@eq _ _ b0') return T (rta b0' t0') (rtb b0' t0') with
| eq_refl => rt1 tt end as t0 in (@eq _ _ b0) return R b0 t0 with
| eq_refl => r1 tt end
= match t' as t0' in (@eq _ _ b0') return (forall (R : forall (b : B (rta b0' t0')), T _ b -> Type)
(r1 : forall y, R (f1 _ y) (@t1 _ y)),
R _ (match t0' as t0'0 in (@eq _ _ b0'0) return T (rta b0'0 t0'0) (rtb b0'0 t0'0) with
| eq_refl => rt1 tt end)) with
| eq_refl => fun _ r1 => match rt1 tt with
| eq_refl => r1 tt end end R r1. Proof. destruct t'; reflexivity. Defined.
Theorem eq_match_beta2
a b (t : T a b)
X
(R : forall b' (t' : T a b'), X b' -> Type)
(r1 : forall y x, R _ (@t1 _ y) x)
x
: match t as t' in (@eq _ _ b') returnforall x, R b' t' x with
| eq_refl => r1 tt end (x b)
= match t as t' in (@eq _ _ b') return R b' t' (x b') with
| eq_refl => r1 tt (x _) end. Proof. destruct t; reflexivity. Defined. End eq.
Definition typeof {T} (_ : T) := T.
Evalcompute in (eq_sym (eq_sym _)). Goalforall T (x y : T) (p : x = y), True. intros. poseproof
(@eq_matches_commute
(existT (fun T => T) T x) y p
(fun b'' _ => existT (fun T => T) T b'')
(fun _ _ => x)
(fun _ => eq_refl)
(fun x' _ => x' = y)
(fun _ => eq_refl)
) as H0. compute in H0. change (fun (x' : T) (_ : y = x') => x' = y) with ((fun y => fun (x' : T) (_ : y = x') => x' = y) y) in H0. poseproof (fun k => @eq_trans _ _ _ k H0). Abort.
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