proposition: Lemma diff_continuous (x : filter_on V) (f : V -> W) : differentiable f x -> continuous ('d f x).
proof: Proof. by move=> /diffP []. 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