fact: Definition measure (R : numDomainType) (mu : set T -> \bar R) (A : set rT) : \bar R := \sum_(X \in decomp A) mu X.
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)