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

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
⊢ ‖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: 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
⊢ ‖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: 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 : 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: filter_upwards [Ioo_mem_nhdsWithin_Iio ⟨hz, le_rfl⟩] with r hr
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: 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
⊢ ‖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: 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
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: refine norm_le_of_forall_mem_frontier_norm_le isBounded_ball hd ?_ ?_
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 ge_of_tendsto ?_ this
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
this : ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
⊢ ‖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
this : ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
⊢ Tendsto (HDiv.hDiv R₂) (𝓝[<] R₁) (𝓝 (R₂ / R₁))

tactic: 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
this : ∀ᶠ (r : ℝ) in 𝓝[<] R₁, ‖dslope f c z‖ ≤ R₂ / r
⊢ Tendsto (HDiv.hDiv R₂) (𝓝[<] R₁) (𝓝 (R₂ / R₁))
state_after: no goals

tactic: refine DifferentiableOn.diffContOnCl ?_
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
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ DiffContOnCl ℂ (dslope f c) (ball c 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
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ DifferentiableOn ℂ (dslope f c) (closure (ball c r))

tactic: rw [closure_ball c hr₀.ne']
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
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ DifferentiableOn ℂ (dslope f c) (closure (ball c 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
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ DifferentiableOn ℂ (dslope f c) (closedBall c r)

tactic: exact ((differentiableOn_dslope <| ball_mem_nhds _ hR₁).mpr hd).mono
  (closedBall_subset_ball hr.2)
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
r : ℝ
hr : r ∈ Ioo (dist z c) R₁
hr₀ : 0 < r
⊢ DifferentiableOn ℂ (dslope f c) (closedBall c r)
state_after: no goals

tactic: rw [frontier_ball c hr₀.ne']
state_before: 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
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 ∈ sphere c r, ‖dslope f c z‖ ≤ R₂ / r

tactic: intro z hz
state_before: 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 ∈ sphere 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 : ℂ
hz : z ∈ sphere c r
⊢ ‖dslope f c z‖ ≤ R₂ / r

tactic: have hz' : z ≠ c := ne_of_mem_sphere hz hr₀.ne'
state_before: 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 : ℂ
hz : z ∈ sphere 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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ ‖dslope f c z‖ ≤ R₂ / r

tactic: rw [dslope_of_ne _ hz', slope_def_module, norm_smul, norm_inv, mem_sphere_iff_norm.1 hz, ←
  div_eq_inv_mul, div_le_div_right hr₀, ← dist_eq_norm]
state_before: 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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ ‖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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ dist (f z) (f c) ≤ R₂

tactic: exact le_of_lt (h_maps (mem_ball.2 (by rw [mem_sphere.1 hz]; exact hr.2)))
state_before: 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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ dist (f z) (f c) ≤ R₂
state_after: no goals

tactic: rw [mem_sphere.1 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
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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ dist z c < 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
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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ r < R₁

tactic: exact hr.2
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
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 : ℂ
hz : z ∈ sphere c r
hz' : z ≠ c
⊢ r < R₁
state_after: no goals

tactic: rw [closure_ball c hr₀.ne', mem_closedBall]
state_before: 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)
state_after: 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)
⊢ dist z c ≤ r

tactic: exact hr.1.le
state_before: 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)
⊢ dist z c ≤ r
state_after: no goals