fact: Definition Diffble_I (a b : IR) (Hab : a [<] b) (F : PartIR) := {f' : CSetoid_fun (subset (Compact (less_leEq _ _ _ Hab))) IR | Derivative_I Hab F (PartInt f')}.
imports: CoRN.ftc.PartInterval CoRN.ftc.DerivativeOps