proposition: Lemma neg_tv_bounded_variation a b f : BV a b f -> BV a b (fine \o neg_tv a f).
proof: Proof. move=> ?; apply: nondecreasing_bounded_variation. exact: fine_neg_tv_nondecreasing. 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)