proposition: Lemma derivableP f x v : derivable f x v -> is_derive x v f ('D_v f x).
proof: Proof. by move=> df; apply: DeriveDef. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum matrix interval) mathcomp(mathcomp_extra boolp classical_sets functions) reals signed topology prodnormedzmodule normedtype landau forms