proposition: Lemma ereal_sup0 : ereal_sup set0 = -oo.
proof: Proof. exact: supremum0. 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