proposition: Lemma limB f g : cvg (f @ F) -> cvg (g @ F) -> lim (f - g @ F) = lim (f @ F) - lim (g @ F).
proof: Proof. by move=> ? ?; apply: cvg_lim => //; apply: cvgB. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(rat interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality set_interval Rstruct) ereal reals signed topology prodnormedzmodule