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Update Liouville.lean
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Mathlib/Analysis/Complex/Liouville.lean

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -36,7 +36,7 @@ radius `R > 0`, is continuous on its closure, and its values on the boundary cir
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are bounded from above by `C`, then the norm of its `n`-th derivative at the center is at most
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`n.factorial * C / R ^ n`. -/
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theorem norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le [CompleteSpace F] {c : ℂ} {R C : ℝ}
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{n : ℕ} {f : ℂ → F} (hR : 0 < R) (hf : DiffContOnCl ℂ f (ball c R))
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{f : ℂ → F} (n : ℕ) (hR : 0 < R) (hf : DiffContOnCl ℂ f (ball c R))
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(hC : ∀ z ∈ sphere c R, ‖f z‖ ≤ C) :
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‖iteratedDeriv n f c‖ ≤ n.factorial * C / R ^ n := by
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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
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smul_comm, smul_inv_smul₀]
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simp [Nat.factorial_ne_zero]
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_ = n.factorial • (2 * π * I)⁻¹ • (∮ z in C(c, R), (1 / (z - c) ^ (n + 1)) • f z) := by
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rw [← (DiffContOnCl.circleIntegral_one_div_sub_center_pow_smul hR n hf)]
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rw [← DiffContOnCl.circleIntegral_one_div_sub_center_pow_smul hR n hf]
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_ = n.factorial • (2 * π * I)⁻¹ • ∮ z in C(c, R), (z - c)⁻¹ ^ (n + 1) • f z := by simp
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calc
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‖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
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private theorem norm_deriv_le_aux [CompleteSpace F] {c : ℂ} {R C : ℝ} {f : ℂ → F} (hR : 0 < R)
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(hf : DiffContOnCl ℂ f (ball c R)) (hC : ∀ z ∈ sphere c R, ‖f z‖ ≤ C) :
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‖deriv f c‖ ≤ C / R := by
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simpa using norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le hR hf hC (n := 1)
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simpa using norm_iteratedDeriv_le_of_forall_mem_sphere_norm_le 1 hR hf hC
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/-- **Cauchy's estimate for the first order derivative**: If `f` is complex differentiable on an
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open disc of radius `R > 0`, is continuous on its closure, and its values on the boundary circle

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