proposition: Lemma derive1E' V f a : differentiable (f : R -> V) a -> f^`() a = 'd f a 1.
proof: Proof. by move=> ?; rewrite derive1E deriveE. 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