proposition: Lemma cvg_zero f a : (f - cst a) @ F --> (0 : V) -> f @ F --> a.
proof: Proof. by move=> Cfa; apply: cvg_sub0 Cfa (cvg_cst _). 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