Theorem: Complex.schwarz_aux
File: Mathlib/Analysis/Complex/Schwarz.lean

Proof steps:
state_before: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : z ∈ ball c R₁
⊢ ‖dslope f c z‖ ≤ R₂ / R₁
state_after: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : z ∈ ball c R₁
hR₁ : 0 < R₁
⊢ ‖dslope f c z‖ ≤ R₂ / R₁
tactic: have hR₁ : 0 < R₁ := nonempty_ball.1 ⟨z, hz⟩
state_before: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : z ∈ ball c R₁
hR₁ : 0 < R₁
⊢ ‖dslope f c z‖ ≤ R₂ / R₁
state_after: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : z ∈ ball c R₁
hR₁ : 0 < R₁
⊢ ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
tactic: suffices ∀ᶠ r in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r by
    refine ge_of_tendsto ?_ this
    exact (tendsto_const_nhds.div tendsto_id hR₁.ne').mono_left nhdsWithin_le_nhds
state_before: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : z ∈ ball c R₁
hR₁ : 0 < R₁
⊢ ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
state_after: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
⊢ ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
tactic: rw [mem_ball] at hz
state_before: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
⊢ ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
state_after: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
⊢ ‖dslope f c z‖ ≤ R₂ / r
tactic: filter_upwards [Ioo_mem_nhdsWithin_Iio ⟨hz, le_rfl⟩] with r hr
state_before: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
⊢ ‖dslope f c z‖ ≤ R₂ / r
state_after: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ ‖dslope f c z‖ ≤ R₂ / r
tactic: have hr₀ : 0 < r := dist_nonneg.trans_lt hr.1
state_before: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
hd : DifferentiableOn ℂ f (ball c R₁)
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ ‖dslope f c z‖ ≤ R₂ / r
state_after: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
hd : DiffContOnCl ℂ (dslope f c) (ball c r)
⊢ ‖dslope f c z‖ ≤ R₂ / r
tactic: replace hd : DiffContOnCl ℂ (dslope f c) (ball c r) := by
    refine DifferentiableOn.diffContOnCl ?_
    rw [closure_ball c hr₀.ne']
    exact ((differentiableOn_dslope <| ball_mem_nhds _ hR₁).mpr hd).mono
      (closedBall_subset_ball hr.2)
state_before: case h
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
hd : DiffContOnCl ℂ (dslope f c) (ball c r)
⊢ ‖dslope f c z‖ ≤ R₂ / r
state_after: case h.refine_1
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
hd : DiffContOnCl ℂ (dslope f c) (ball c r)
⊢ ∀ z ∈ frontier (ball c r), ‖dslope f c z‖ ≤ R₂ / r

case h.refine_2
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℂ E
R R₁ R₂ : ℝ
f✝ : ℂ → E
c z z₀ : ℂ
f : ℂ → ℂ
h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)
hz : dist z c < R₁
hR₁ : 0 < R₁
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
hd : DiffContOnCl ℂ (dslope f c) (ball c r)
⊢ z ∈ closure (ball c r)
tactic: refine norm_le_of_forall_mem_frontier_norm_le isBounded_ball hd ?_ ?_