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(* 02110-1301 USA                                                     *)
(* Contribution to the Coq Library   V6.3 (July 1999)                    *)
Require Export Plump.

Lemma Vee_sound : forall E1 E2 : Ens, EQ E1 E2 -> EQ (Vee E1) (Vee E2).
simple induction E1; intros A1 f1 HR1; simple induction E2; intros A2 f2 HR2.