l3lab/ntp-mathlib huggingface dataset:
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        

Proof state:
case h.e'_5.h.e'_3
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
⊢ 1 = 1⁻¹

Next tactic:
exact inv_one.symm
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      

Proof state:
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
⊢ ∃ V' ∈ 𝓝 1, 0 ∉ V' ∧ ∀ x ∈ V', ∀ y ∈ V', x * y⁻¹ ∈ V

Next tactic:
rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      

Proof state:
case intro.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
⊢ ∃ V' ∈ 𝓝 1, 0 ∉ V' ∧ ∀ x ∈ V', ∀ y ∈ V', x * y⁻¹ ∈ V

Next tactic:
let hatKstar := ({0}ᶜ : Set <| hat K)
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      

Proof state:
case intro.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
⊢ ∃ V' ∈ 𝓝 1, 0 ∉ V' ∧ ∀ x ∈ V', ∀ y ∈ V', x * y⁻¹ ∈ V

Next tactic:
have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      

Proof state:
case intro.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
⊢ ∃ V' ∈ 𝓝 1, 0 ∉ V' ∧ ∀ x ∈ V', ∀ y ∈ V', x * y⁻¹ ∈ V

Next tactic:
use U ∩ hatKstar, Filter.inter_mem U_in this
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      

Proof state:
case right
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
⊢ 0 ∉ U ∩ hatKstar ∧ ∀ x ∈ U ∩ hatKstar, ∀ y ∈ U ∩ hatKstar, x * y⁻¹ ∈ V

Next tactic:
constructor
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      constructor
      · 

Proof state:
case right.left
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
⊢ 0 ∉ U ∩ hatKstar

Next tactic:
rintro ⟨_, h'⟩
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      constructor
      · rintro ⟨_, h'⟩
        

Proof state:
case right.left.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
left✝ : 0 ∈ U
h' : 0 ∈ hatKstar
⊢ False

Next tactic:
rw [mem_compl_singleton_iff] at h'
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      constructor
      · rintro ⟨_, h'⟩
        rw [mem_compl_singleton_iff] at h'
        

Proof state:
case right.left.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
left✝ : 0 ∈ U
h' : 0 ≠ 0
⊢ False

Next tactic:
exact h' rfl
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      constructor
      · rintro ⟨_, h'⟩
        rw [mem_compl_singleton_iff] at h'
        exact h' rfl
      · 

Proof state:
case right.right
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
⊢ ∀ x ∈ U ∩ hatKstar, ∀ y ∈ U ∩ hatKstar, x * y⁻¹ ∈ V

Next tactic:
rintro x ⟨hx, _⟩ y ⟨hy, _⟩
theorem continuous_extension : Continuous (Valued.extension : hat K → Γ₀) := by
  refine' Completion.denseInducing_coe.continuous_extend _
  intro x₀
  rcases eq_or_ne x₀ 0 with (rfl | h)
  · refine' ⟨0, _⟩
    erw [← Completion.denseInducing_coe.toInducing.nhds_eq_comap]
    exact Valued.continuous_valuation.tendsto' 0 0 (map_zero v)
  · have preimage_one : v ⁻¹' {(1 : Γ₀)} ∈ 𝓝 (1 : K) := by
      have : (v (1 : K) : Γ₀) ≠ 0 := by
        rw [Valuation.map_one]
        exact zero_ne_one.symm
      convert Valued.loc_const this
      ext x
      rw [Valuation.map_one, mem_preimage, mem_singleton_iff, mem_setOf_eq]
    obtain ⟨V, V_in, hV⟩ : ∃ V ∈ 𝓝 (1 : hat K), ∀ x : K, (x : hat K) ∈ V → (v x : Γ₀) = 1 := by
      rwa [Completion.denseInducing_coe.nhds_eq_comap, mem_comap] at preimage_one
    have : ∃ V' ∈ 𝓝 (1 : hat K), (0 : hat K) ∉ V' ∧ ∀ (x) (_ : x ∈ V') (y) (_ : y ∈ V'),
      x * y⁻¹ ∈ V := by
      have : Tendsto (fun p : hat K × hat K => p.1 * p.2⁻¹) ((𝓝 1) ×ˢ (𝓝 1)) (𝓝 1) := by
        rw [← nhds_prod_eq]
        conv =>
          congr
          rfl
          rfl
          rw [← one_mul (1 : hat K)]
        refine'
          Tendsto.mul continuous_fst.continuousAt (Tendsto.comp _ continuous_snd.continuousAt)
        -- Porting note: Added `ContinuousAt.tendsto`
        convert (continuousAt_inv₀ (zero_ne_one.symm : 1 ≠ (0 : hat K))).tendsto
        exact inv_one.symm
      rcases tendsto_prod_self_iff.mp this V V_in with ⟨U, U_in, hU⟩
      let hatKstar := ({0}ᶜ : Set <| hat K)
      have : hatKstar ∈ 𝓝 (1 : hat K) := compl_singleton_mem_nhds zero_ne_one.symm
      use U ∩ hatKstar, Filter.inter_mem U_in this
      constructor
      · rintro ⟨_, h'⟩
        rw [mem_compl_singleton_iff] at h'
        exact h' rfl
      · rintro x ⟨hx, _⟩ y ⟨hy, _⟩
        

Proof state:
case right.right.intro.intro
K : Type u_1
inst✝¹ : Field K
Γ₀ : Type u_2
inst✝ : LinearOrderedCommGroupWithZero Γ₀
hv : Valued K Γ₀
x₀ : hat K
h : x₀ ≠ 0
preimage_one : ⇑v ⁻¹' {1} ∈ 𝓝 1
V : Set (hat K)
V_in : V ∈ 𝓝 1
hV : ∀ (x : K), ↑K x ∈ V → v x = 1
this✝ : Tendsto (fun p => p.1 * p.2⁻¹) (𝓝 1 ×ˢ 𝓝 1) (𝓝 1)
U : Set (hat K)
U_in : U ∈ 𝓝 1
hU : ∀ (x x' : hat K), x ∈ U → x' ∈ U → (x, x').1 * (x, x').2⁻¹ ∈ V
hatKstar : Set (hat K) := {0}ᶜ
this : hatKstar ∈ 𝓝 1
x : hat K
hx : x ∈ U
right✝¹ : x ∈ hatKstar
y : hat K
hy : y ∈ U
right✝ : y ∈ hatKstar
⊢ x * y⁻¹ ∈ V

Next tactic:
apply hU