fact: Definition Derivative_I F' (P':=Dom F') := included I (Dom F) and included I (Dom F') and (forall e, [0] [<] e -> {d : IR | [0] [<] d | forall x y, I x -> I y -> forall Hx Hy Hx', AbsIR (x[-]y) [<=] d -> AbsIR (F y Hy[-]F x Hx[-]F' x Hx'[*] (y[-]x)) [<=] e[*]AbsIR (y[-]x)}).
imports: CoRN.ftc.Continuity