@@ -36,7 +36,7 @@ radius `R > 0`, is continuous on its closure, and its values on the boundary cir
3636are bounded from above by `C`, then the norm of its `n`-th derivative at the center is at most
3737`n.factorial * C / R ^ n`. -/
3838theorem norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le [CompleteSpace F] {c : ℂ} {R C : ℝ}
39- {n : ℕ} { f : ℂ → F} (hR : 0 < R) (hf : DiffContOnCl ℂ f (ball c R))
39+ {f : ℂ → F} (n : ℕ) (hR : 0 < R) (hf : DiffContOnCl ℂ f (ball c R))
4040 (hC : ∀ z ∈ sphere c R, ‖f z‖ ≤ C) :
4141 ‖iteratedDeriv n f c‖ ≤ n.factorial * C / R ^ n := by
4242 have hp (z) (hz : ‖z - c‖ = R) : ‖(z - c)⁻¹ ^ (n + 1 ) • f z‖ ≤ C / (R ^ n * R) := by
@@ -51,7 +51,7 @@ theorem norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le [CompleteSpace F] {c
5151 smul_comm, smul_inv_smul₀]
5252 simp [Nat.factorial_ne_zero]
5353 _ = n.factorial • (2 * π * I)⁻¹ • (∮ z in C(c, R), (1 / (z - c) ^ (n + 1 )) • f z) := by
54- rw [← ( DiffContOnCl.circleIntegral_one_div_sub_center_pow_smul hR n hf) ]
54+ rw [← DiffContOnCl.circleIntegral_one_div_sub_center_pow_smul hR n hf]
5555 _ = n.factorial • (2 * π * I)⁻¹ • ∮ z in C(c, R), (z - c)⁻¹ ^ (n + 1 ) • f z := by simp
5656 calc
5757 ‖iteratedDeriv n f c‖ = ‖n.factorial • (2 * π * I)⁻¹ •
@@ -65,7 +65,7 @@ theorem norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le [CompleteSpace F] {c
6565private theorem norm_deriv_le_aux [CompleteSpace F] {c : ℂ} {R C : ℝ} {f : ℂ → F} (hR : 0 < R)
6666 (hf : DiffContOnCl ℂ f (ball c R)) (hC : ∀ z ∈ sphere c R, ‖f z‖ ≤ C) :
6767 ‖deriv f c‖ ≤ C / R := by
68- simpa using norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le hR hf hC (n := 1 )
68+ simpa using norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le 1 hR hf hC
6969
7070/-- **Cauchy's estimate for the first order derivative** : If `f` is complex differentiable on an
7171open disc of radius `R > 0`, is continuous on its closure, and its values on the boundary circle
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