proposition: Lemma eq_eseriesl (R : realFieldType) (P Q : pred nat) (f : (\bar R)^nat) : P =1 Q -> \sum_(i <oo | P i) f i = \sum_(i <oo | Q i) f i.
proof: Proof. by move=> efg; apply/congr_lim/funext => n; apply: eq_bigl. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(set_interval) reals ereal signed topology normedtype landau