fact: Definition summable (I : choiceType) {K : realType} {R : normedModType K} (x : I -> R) := \forall M \near +oo%R, \forall J \near totally, (partial_sum (fun i => `|x i|) J <= M)%R.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(interval zmodp) mathcomp(boolp classical_sets) ereal reals Rstruct signed topology normedtype