proposition: Lemma total_variation_opp a b f : TV a b f = TV (- b) (- a) (f \o -%R).
proof: Proof. by rewrite /total_variation variations_opp. 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)