proposition: Lemma bounded_variationN a b f : BV a b f -> BV a b (\- f).
proof: Proof. by rewrite /bounded_variation variationsN. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum finmap) mathcomp(matrix interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality) ereal reals signed topology prodnormedzmodule normedtype derive sequences real_interval HB(structures)