proposition: Corollary is_const_ext_weak (f g : R -> ExtendedR) (X c : interval) : (forall x : R, f x = g x) -> is_const f X c -> is_const g X c.
proof: Proof. move=> Hmain. apply: is_const_ext. move=> x _; exact: Hmain. Qed.
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