proposition: Lemma nbhs_norm_le_nbhs x : nbhs_norm x `=>` nbhs x.
proof: Proof. by move=> P /nbhs_normP [e e0 Pxe]; exists e. 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