proposition: Lemma ereal_infT : ereal_inf [set: \bar R] = -oo.
proof: Proof. by rewrite /ereal_inf range_oppe/= ereal_supT. 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