fact: Definition sfinite_measure d (T : measurableType d) (R : realType) (mu : set T -> \bar R) := exists2 s : {measure set T -> \bar R}^nat, forall n, fin_num_fun (s n) & forall U, measurable U -> mu U = mseries s 0 U.
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)