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(* 02110-1301 USA                                                     *)
Require Export Euclid.
(*********************************************************************** ********************************************************************** ********************************************************************** Some Arith Facts.*)

(* Specifications: *)
Theorem lt_mult_right : forall x y z t : nat, x < z -> y < t -> x * y < z * t.
intros x y z t; case x; case z.