fact: Definition Iconst (i : I.type) := I.bounded i && I.subset i (I.bnd (I.lower i) (I.lower i)).
imports: Coq(Reals ZArith Psatz) mathcomp.ssreflect(ssreflect ssrbool ssrfun eqtype ssrnat seq bigop) Interval Xreal Basic Interval_compl Datatypes Taylor_model_sharp Bound Bound_quad Univariate_sig