proposition: Lemma derive1n0 V (f : R -> V) : f^`(0) = f.
proof: Proof. by []. 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