fact: Definition measurable_fun d d' (T : measurableType d) (U : measurableType d') (D : set T) (f : T -> U) := measurable D -> forall Y, measurable Y -> measurable (D `&` f @^-1` Y).
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)