fact: Definition summable (T : choiceType) (R : realType) (D : set T) (f : T -> \bar R) := (\esum_(x in D) `| f x | < +oo)%E.
imports: mathcomp(all_ssreflect ssralg ssrnum finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop) reals ereal signed topology sequences normedtype numfun