fact: Definition measurable_cover X := [set F : (set T)^nat | (forall i, measurable (F i)) /\ X `<=` \bigcup_k (F k)].
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)