fact: Definition Rderive_over (f f' : R -> R) := forall x : R, P x -> is_derive f x (f' x).
imports: Coq(ZArith Reals Psatz) mathcomp.ssreflect(ssreflect ssrbool ssrfun eqtype ssrnat bigop) Coquelicot(Coquelicot) Stdlib MathComp Xreal Interval Taylor