theorem extracted_formal_statement_114.{u_1, w, u} {Ω : Type u} [inst : MeasurableSpace Ω] {Z : Type w} {n : ℕ}
  {ι : Type u_1} {f : ι → Z → ℝ} {μ : Measure Ω} [inst_1 : IsProbabilityMeasure μ] {X : Ω → Z} [inst_3 : Countable ι]
  (hf : ∀ (i : ι), Measurable (f i ∘ X)) (i : ι) (i' : Fin n) (hi : i' ∈ Finset.univ) :
  Measurable fun a => f i (X (a.1 i')) := sorry

State before:
case hf.left.hf.hf.hg.hf.hf.hf.hf.hg
Ω : Type u
inst✝¹ : MeasurableSpace Ω
Z : Type w
n : ℕ
ι : Type u_1
f : ι → Z → ℝ
μ : Measure Ω
inst✝ : IsProbabilityMeasure μ
X : Ω → Z
inst_3 : Countable ι
hf : ∀ (i : ι), Measurable (f i ∘ X)
i : ι
i' : Fin n
hi : i' ∈ Finset.univ
⊢ Measurable fun a => f i (X (a.1 i'))

Tactic: apply (hf i).comp measurable_fst.eval

State after:

Relevant lemmas: