proposition: Fact ub_floor_set x : Real.ub (floor_set x) x.
proof: Proof. by move=> y [m]. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)