proposition: Lemma measure_addE A : measure_add A = m1 A + m2 A.
proof: Proof. by rewrite /measure_add/= /msum 2!big_ord_recl/= big_ord0 adde0. Qed.
imports: mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) reals ereal signed topology normedtype sequences esum numfun HB(structures)