no goals
α : Type u_2
β : Type u_3
ι : Type u_1
mα : MeasurableSpace α
mβ : MeasurableSpace β
I : Finset ι
κ : ι → { x // x ∈ kernel α β }
a : α
⊢ ↑(∑ i in I, κ i) a = ∑ i in I, ↑(κ i) a
rw [coe_finset_sum, Finset.sum_apply]