proposition: Lemma nbhs_le_nbhs_norm (x : V) : @nbhs V _ x `=>` nbhs_norm x.
proof: Proof. by move=> P [e e0 subP]; apply/nbhs_normP; 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