proposition: Lemma ereal_ub_pinfty S : ubound S +oo.
proof: Proof. by apply/ubP=> x _; rewrite leey. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(fsbigop cardinality set_interval) reals signed topology constructive_ereal