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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
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(*         *     GNU Lesser General Public License Version 2.1          *)
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Local Open Scope R_scope.

Lemma tech1 :
forall (An:nat -> R) (N:nat),
(forall n:nat, (n <= N)%nat -> 0 < An n) -> 0 < sum_f_R0 An N.