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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
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(*         *     GNU Lesser General Public License Version 2.1          *)
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Local Open Scope R_scope.

Lemma derivable_pt_div :
forall (f1 f2:R -> R) (x:R),
derivable_pt f1 x ->
derivable_pt f2 x -> f2 x <> 0 -> derivable_pt (f1 / f2) x.