no goals
α : Type u_1
β : Type ?u.10618
γ : Type ?u.10621
δ : Type ?u.10624
ι : Type ?u.10627
R : Type ?u.10630
R' : Type ?u.10633
m : MeasurableSpace α
μ μ₁ μ₂ : Measure α
s s₁ s₂ t : Set α
S : Set (Set α)
hs : Set.Countable S
hd : Set.Pairwise S (AEDisjoint μ)
h : ∀ (s : Set α), s ∈ S → NullMeasurableSet s
⊢ ↑↑μ (⋃₀ S) = ∑' (s : ↑S), ↑↑μ ↑s
rw [sUnion_eq_biUnion, measure_biUnion₀ hs hd h]