fact: Definition is_const (f : R -> ExtendedR) (X c : interval) : Prop := exists2 y : ExtendedR, contains c y & forall x : R, contains X (Xreal x) -> f x = y.
imports: Coq(ZArith Psatz Reals) Flocq(Raux) Coquelicot(Coquelicot) mathcomp.ssreflect(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype bigop) Stdlib MathComp Coquelicot Xreal Interval Basic Xreal_derive Interval_compl Datatypes Taylor_poly Basic_rec Bound