Theorem: ContinuousOn.comp_fract'
File: Mathlib/Topology/Algebra/Order/Floor.lean

tactic: change Continuous (uncurry f ∘ Prod.map id fract)
state_before: α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
⊢ Continuous fun st => f st.fst (fract st.snd)

tactic: rw [continuous_iff_continuousAt]
state_before: α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
⊢ Continuous (uncurry f ∘ Prod.map id fract)

tactic: rintro ⟨s, t⟩
state_before: α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
⊢ ∀ (x : β × α), ContinuousAt (uncurry f ∘ Prod.map id fract) x

tactic: rcases em (∃ n : ℤ, t = n) with (⟨n, rfl⟩ | ht)
state_before: case mk
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
t : α
⊢ ContinuousAt (uncurry f ∘ Prod.map id fract) (s, t)

tactic: rw [ContinuousAt, nhds_prod_eq, ← nhds_left'_sup_nhds_right (n : α), prod_sup, tendsto_sup]
state_before: case mk.inl.intro
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ ContinuousAt (uncurry f ∘ Prod.map id fract) (s, ↑n)

tactic: constructor
state_before: case mk.inl.intro
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ Tendsto (uncurry f ∘ Prod.map id fract) (𝓝 s ×ˢ 𝓝[Iio ↑n] ↑n) (𝓝 ((uncurry f ∘ Prod.map id fract) (s, ↑n))) ∧
    Tendsto (uncurry f ∘ Prod.map id fract) (𝓝 s ×ˢ 𝓝[Ici ↑n] ↑n) (𝓝 ((uncurry f ∘ Prod.map id fract) (s, ↑n)))

tactic: refine (((h (s, 1) ⟨trivial, zero_le_one, le_rfl⟩).tendsto.mono_left ?_).comp
  (tendsto_id.prod_map (tendsto_fract_left _))).mono_right (le_of_eq ?_)
state_before: case mk.inl.intro.left
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ Tendsto (uncurry f ∘ Prod.map id fract) (𝓝 s ×ˢ 𝓝[Iio ↑n] ↑n) (𝓝 ((uncurry f ∘ Prod.map id fract) (s, ↑n)))

tactic: rw [nhdsWithin_prod_eq, nhdsWithin_univ, ← nhdsWithin_Ico_eq_nhdsWithin_Iio one_pos]
state_before: case mk.inl.intro.left.refine_1
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ 𝓝 s ×ˢ 𝓝[Iio 1] 1 ≤ 𝓝[univ ×ˢ Icc 0 1] (s, 1)

tactic: exact Filter.prod_mono le_rfl (nhdsWithin_mono _ Ico_subset_Icc_self)
state_before: case mk.inl.intro.left.refine_1
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ 𝓝 s ×ˢ 𝓝[Ico 0 1] 1 ≤ 𝓝 s ×ˢ 𝓝[Icc 0 1] 1

tactic: simp [hf]
state_before: case mk.inl.intro.left.refine_2
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ 𝓝 (uncurry f (s, 1)) = 𝓝 ((uncurry f ∘ Prod.map id fract) (s, ↑n))

tactic: refine (((h (s, 0) ⟨trivial, le_rfl, zero_le_one⟩).tendsto.mono_left <| le_of_eq ?_).comp
  (tendsto_id.prod_map (tendsto_fract_right _))).mono_right (le_of_eq ?_) <;>
  simp [nhdsWithin_prod_eq, nhdsWithin_univ]
state_before: case mk.inl.intro.right
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
n : ℤ
⊢ Tendsto (uncurry f ∘ Prod.map id fract) (𝓝 s ×ˢ 𝓝[Ici ↑n] ↑n) (𝓝 ((uncurry f ∘ Prod.map id fract) (s, ↑n)))

tactic: replace ht : t ≠ ⌊t⌋ := fun ht' => ht ⟨_, ht'⟩
state_before: case mk.inr
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
t : α
ht : ¬∃ n, t = ↑n
⊢ ContinuousAt (uncurry f ∘ Prod.map id fract) (s, t)

tactic: refine (h.continuousAt ?_).comp (continuousAt_id.prod_map (continuousAt_fract ht))
state_before: case mk.inr
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
t : α
ht : t ≠ ↑⌊t⌋
⊢ ContinuousAt (uncurry f ∘ Prod.map id fract) (s, t)

tactic: exact prod_mem_nhds univ_mem (Icc_mem_nhds (fract_pos.2 ht) (fract_lt_one _))
state_before: case mk.inr
α : Type u_1
β : Type u_2
γ : Type u_3
inst✝⁵ : LinearOrderedRing α
inst✝⁴ : FloorRing α
inst✝³ : TopologicalSpace α
inst✝² : OrderTopology α
inst✝¹ : TopologicalSpace β
inst✝ : TopologicalSpace γ
f : β → α → γ
h : ContinuousOn (uncurry f) (univ ×ˢ Icc 0 1)
hf : ∀ (s : β), f s 0 = f s 1
s : β
t : α
ht : t ≠ ↑⌊t⌋
⊢ univ ×ˢ Icc 0 1 ∈ 𝓝 (Prod.map id fract (s, t))