proposition: Lemma continuousV s x : s x != 0 -> {for x, continuous s} -> {for x, continuous (fun x => (s x)^-1%R)}.
proof: Proof. by move=> ?; apply: cvgV. 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