proposition: Lemma eseries0 P : (forall i, P i -> f i = 0) -> \sum_(i <oo | P i) f i = 0.
proof: Proof. by move=> f0; under eq_fun do rewrite big1//; rewrite lim_cst. 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