proposition: Lemma nbhs_nbhs_norm : nbhs_norm = nbhs.
proof: Proof. by rewrite ball_normE funeqE => x; rewrite -filter_from_ballE. 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