proposition: Lemma ereal_nbhs_ninfty_real : \forall x \near -oo, fine x \is @Num.real R.
proof: Proof. apply: filterS (ereal_nbhs_ninfty_lt (@real0 _)) => x. by case: x => //= x; apply: ltr0_real. 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