proposition: Lemma nbhs_normP x (P : V -> Prop) : (\near x, P x) <-> nbhs_norm x P.
proof: Proof. by rewrite nbhs_nbhs_norm. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(rat interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality set_interval Rstruct) ereal reals signed topology prodnormedzmodule