Theorem: cfc_le_one
File: Mathlib/Analysis/CstarAlgebra/ContinuousFunctionalCalculus/Unital.lean

Proof steps:
state_before: R : Type u_1
A : Type u_2
p : A → Prop
inst✝¹⁵ : OrderedCommSemiring R
inst✝¹⁴ : StarRing R
inst✝¹³ : StarOrderedRing R
inst✝¹² : MetricSpace R
inst✝¹¹ : TopologicalSemiring R
inst✝¹⁰ : ContinuousStar R
inst✝⁹ : ∀ (α : Type ?u.783706) [inst : TopologicalSpace α], StarOrderedRing C(α, R)
inst✝⁸ : TopologicalSpace A
inst✝⁷ : Ring A
inst✝⁶ : StarRing A
inst✝⁵ : PartialOrder A
inst✝⁴ : StarOrderedRing A
inst✝³ : Algebra R A
inst✝² : StarModule R A
inst✝¹ : ContinuousFunctionalCalculus R p
inst✝ : NonnegSpectrumClass R A
f : R → R
a : A
h : ∀ x ∈ spectrum R a, f x ≤ 1
hf : ContinuousOn f (spectrum R a)
ha : p a
⊢ (cfcHom ha) { toFun := (spectrum R a).restrict f, continuous_toFun := ⋯ } ≤ 1
state_after: R : Type u_1
A : Type u_2
p : A → Prop
inst✝¹⁵ : OrderedCommSemiring R
inst✝¹⁴ : StarRing R
inst✝¹³ : StarOrderedRing R
inst✝¹² : MetricSpace R
inst✝¹¹ : TopologicalSemiring R
inst✝¹⁰ : ContinuousStar R
inst✝⁹ : ∀ (α : Type ?u.783706) [inst : TopologicalSpace α], StarOrderedRing C(α, R)
inst✝⁸ : TopologicalSpace A
inst✝⁷ : Ring A
inst✝⁶ : StarRing A
inst✝⁵ : PartialOrder A
inst✝⁴ : StarOrderedRing A
inst✝³ : Algebra R A
inst✝² : StarModule R A
inst✝¹ : ContinuousFunctionalCalculus R p
inst✝ : NonnegSpectrumClass R A
f : R → R
a : A
h : ∀ x ∈ spectrum R a, f x ≤ 1
hf : ContinuousOn f (spectrum R a)
ha : p a
⊢ (cfcHom ha) { toFun := (spectrum R a).restrict f, continuous_toFun := ⋯ } ≤ (cfcHom ha) 1
tactic: rw [← map_one (cfcHom ha (R := R))]
state_before: R : Type u_1
A : Type u_2
p : A → Prop
inst✝¹⁵ : OrderedCommSemiring R
inst✝¹⁴ : StarRing R
inst✝¹³ : StarOrderedRing R
inst✝¹² : MetricSpace R
inst✝¹¹ : TopologicalSemiring R
inst✝¹⁰ : ContinuousStar R
inst✝⁹ : ∀ (α : Type ?u.783706) [inst : TopologicalSpace α], StarOrderedRing C(α, R)
inst✝⁸ : TopologicalSpace A
inst✝⁷ : Ring A
inst✝⁶ : StarRing A
inst✝⁵ : PartialOrder A
inst✝⁴ : StarOrderedRing A
inst✝³ : Algebra R A
inst✝² : StarModule R A
inst✝¹ : ContinuousFunctionalCalculus R p
inst✝ : NonnegSpectrumClass R A
f : R → R
a : A
h : ∀ x ∈ spectrum R a, f x ≤ 1
hf : ContinuousOn f (spectrum R a)
ha : p a
⊢ (cfcHom ha) { toFun := (spectrum R a).restrict f, continuous_toFun := ⋯ } ≤ (cfcHom ha) 1
state_after: R : Type u_1
A : Type u_2
p : A → Prop
inst✝¹⁵ : OrderedCommSemiring R
inst✝¹⁴ : StarRing R
inst✝¹³ : StarOrderedRing R
inst✝¹² : MetricSpace R
inst✝¹¹ : TopologicalSemiring R
inst✝¹⁰ : ContinuousStar R
inst✝⁹ : ∀ (α : Type u_1) [inst : TopologicalSpace α], StarOrderedRing C(α, R)
inst✝⁸ : TopologicalSpace A
inst✝⁷ : Ring A
inst✝⁶ : StarRing A
inst✝⁵ : PartialOrder A
inst✝⁴ : StarOrderedRing A
inst✝³ : Algebra R A
inst✝² : StarModule R A
inst✝¹ : ContinuousFunctionalCalculus R p
inst✝ : NonnegSpectrumClass R A
f : R → R
a : A
h : ∀ x ∈ spectrum R a, f x ≤ 1
hf : ContinuousOn f (spectrum R a)
ha : p a
⊢ { toFun := (spectrum R a).restrict f, continuous_toFun := ⋯ } ≤ 1
tactic: apply cfcHom_mono ha
state_before: R : Type u_1
A : Type u_2
p : A → Prop
inst✝¹⁵ : OrderedCommSemiring R
inst✝¹⁴ : StarRing R
inst✝¹³ : StarOrderedRing R
inst✝¹² : MetricSpace R
inst✝¹¹ : TopologicalSemiring R
inst✝¹⁰ : ContinuousStar R
inst✝⁹ : ∀ (α : Type u_1) [inst : TopologicalSpace α], StarOrderedRing C(α, R)
inst✝⁸ : TopologicalSpace A
inst✝⁷ : Ring A
inst✝⁶ : StarRing A
inst✝⁵ : PartialOrder A
inst✝⁴ : StarOrderedRing A
inst✝³ : Algebra R A
inst✝² : StarModule R A
inst✝¹ : ContinuousFunctionalCalculus R p
inst✝ : NonnegSpectrumClass R A
f : R → R
a : A
h : ∀ x ∈ spectrum R a, f x ≤ 1
hf : ContinuousOn f (spectrum R a)
ha : p a
⊢ { toFun := (spectrum R a).restrict f, continuous_toFun := ⋯ } ≤ 1
state_after: no goals
tactic: simpa [ContinuousMap.le_def] using h