Section FuncEq.
Variables (A1 A2 A3 A4 A5 A6 A7 B : Type).
Proof using. intros. subst. auto. Qed.
Proof using. intros. subst. auto. Qed.
Proof using. intros. subst. auto. Qed.
Proof using. intros. subst. auto. Qed.
Proof using. intros. subst. auto. Qed.

Lemma args_eq_6 : forall (f:A1->A2->A3->A4->A5->A6->B) x1 y1 x2 y2 x3 y3 x4 y4 x5 y5 x6 y6,
x1 = y1 -> x2 = y2 -> x3 = y3 -> x4 = y4 -> x5 = y5 -> x6 = y6 ->
f x1 x2 x3 x4 x5 x6 = f y1 y2 y3 y4 y5 y6.