Theorem: MeasureTheory.FiniteMeasure.injective_toWeakDualBCNN
File: Mathlib/MeasureTheory/Measure/FiniteMeasure.lean

Proof steps:
state_before: Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
⊢ Injective toWeakDualBCNN
state_after: Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
⊢ μ = ν
tactic: intro μ ν hμν
state_before: Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
⊢ μ = ν
state_after: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
⊢ ∀ (f : Ω →ᵇ ℝ≥0), ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
tactic: apply ext_of_forall_lintegral_eq
state_before: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
⊢ ∀ (f : Ω →ᵇ ℝ≥0), ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
state_after: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
⊢ ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
tactic: intro f
state_before: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
⊢ ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
state_after: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
key : μ.toWeakDualBCNN f = ν.toWeakDualBCNN f
⊢ ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
tactic: have key := congr_fun (congrArg DFunLike.coe hμν) f
state_before: case h
Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
key : μ.toWeakDualBCNN f = ν.toWeakDualBCNN f
⊢ ∫⁻ (x : Ω), ↑(f x) ∂↑μ = ∫⁻ (x : Ω), ↑(f x) ∂↑ν
state_after: Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
key : μ.toWeakDualBCNN f = ν.toWeakDualBCNN f
⊢ ∫⁻ (ω : Ω), ↑(f ω) ∂↑μ ≠ ⊤

Ω : Type u_1
inst✝⁷ : MeasurableSpace Ω
R : Type u_2
inst✝⁶ : SMul R ℝ≥0
inst✝⁵ : SMul R ℝ≥0∞
inst✝⁴ : IsScalarTower R ℝ≥0 ℝ≥0∞
inst✝³ : IsScalarTower R ℝ≥0∞ ℝ≥0∞
inst✝² : TopologicalSpace Ω
inst✝¹ : HasOuterApproxClosed Ω
inst✝ : BorelSpace Ω
μ ν : FiniteMeasure Ω
hμν : μ.toWeakDualBCNN = ν.toWeakDualBCNN
f : Ω →ᵇ ℝ≥0
key : μ.toWeakDualBCNN f = ν.toWeakDualBCNN f
⊢ ∫⁻ (ω : Ω), ↑(f ω) ∂↑ν ≠ ⊤
tactic: apply (ENNReal.toNNReal_eq_toNNReal_iff' ?_ ?_).mp key