Theorem: ContinuousOn.image_uIcc
File: Mathlib/Topology/Algebra/Order/Compact.lean

tactic: refine h.image_uIcc_eq_Icc.trans (uIcc_of_le ?_).symm
state_before: α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ f '' [[a, b]] = [[sInf (f '' [[a, b]]), sSup (f '' [[a, b]])]]
state_after: α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ sInf (f '' [[a, b]]) ≤ sSup (f '' [[a, b]])

tactic: refine csInf_le_csSup ?_ ?_ (nonempty_uIcc.image _) <;> rw [h.image_uIcc_eq_Icc]
state_before: α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ sInf (f '' [[a, b]]) ≤ sSup (f '' [[a, b]])
state_after: case refine_1
α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ BddBelow (Icc (sInf (f '' [[a, b]])) (sSup (f '' [[a, b]])))

case refine_2
α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ BddAbove (Icc (sInf (f '' [[a, b]])) (sSup (f '' [[a, b]])))

tactic: exacts [bddBelow_Icc, bddAbove_Icc]
state_before: case refine_1
α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ BddBelow (Icc (sInf (f '' [[a, b]])) (sSup (f '' [[a, b]])))

case refine_2
α✝ : Type u_1
α : Type u_2
β : Type u_3
γ : Type u_4
inst✝⁷ : ConditionallyCompleteLinearOrder α
inst✝⁶ : TopologicalSpace α
inst✝⁵ : OrderTopology α
inst✝⁴ : TopologicalSpace β
inst✝³ : TopologicalSpace γ
inst✝² : DenselyOrdered α
inst✝¹ : ConditionallyCompleteLinearOrder β
inst✝ : OrderTopology β
f : α → β
a b c : α
h : ContinuousOn f [[a, b]]
⊢ BddAbove (Icc (sInf (f '' [[a, b]])) (sSup (f '' [[a, b]])))
state_after: no goals