α : Type u_1
β : Type u_2
γ : Type ?u.72940
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 (Icc a b)
hc : c ∈ Icc a b
this : f c ∈ f '' Icc a b
⊢ sInf (f '' Icc a b) ≤ f c
α : Type u_1
β : Type u_2
γ : Type ?u.72940
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 (Icc a b)
hc : c ∈ Icc a b
⊢ sInf (f '' Icc a b) ≤ f c
have := mem_image_of_mem f hc
α : Type u_1
β : Type u_2
γ : Type ?u.72940
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 (Icc a b)
hc : c ∈ Icc a b
this : f c ∈ Icc (sInf (f '' Icc a b)) (sSup (f '' Icc a b))
⊢ sInf (f '' Icc a b) ≤ f c
α : Type u_1
β : Type u_2
γ : Type ?u.72940
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 (Icc a b)
hc : c ∈ Icc a b
this : f c ∈ f '' Icc a b
⊢ sInf (f '' Icc a b) ≤ f c
rw [h.image_Icc (hc.1.trans hc.2)] at this
no goals
α : Type u_1
β : Type u_2
γ : Type ?u.72940
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 (Icc a b)
hc : c ∈ Icc a b
this : f c ∈ Icc (sInf (f '' Icc a b)) (sSup (f '' Icc a b))
⊢ sInf (f '' Icc a b) ≤ f c
exact this.1