no goals
G : Type u_1
H : Type ?u.165138
α : Type u_2
β : Type ?u.165144
E : Type ?u.165147
inst✝¹⁰ : Group G
inst✝⁹ : Group H
inst✝⁸ : MulAction G α
inst✝⁷ : MeasurableSpace α
inst✝⁶ : MulAction H β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝³ : MeasurableSpace G
inst✝² : MeasurableSMul G α
inst✝¹ : SMulInvariantMeasure G α μ
inst✝ : Countable G
ν : Measure α
h : IsFundamentalDomain G s
hν : ν ≪ μ
f : α → ℝ≥0∞
⊢ (∫⁻ (x : α), f x ∂ν) = ∑' (g : G), ∫⁻ (x : α) in g • s, f x ∂ν
rw [← lintegral_sum_measure, h.sum_restrict_of_ac hν]