proposition: Lemma ereal_sup1 x : ereal_sup [set x] = x.
proof: Proof. exact: supremum1. 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