refine Measurable.comp ?_ (by fun_prop) |>.smul (by fun_prop)
  |>.nnnorm |>.coe_nnreal_ennreal
n✝ : ℕ
A a b c d u x✝ y t σ' : ℝ
ψ Ψ : ℝ → ℂ
F G : ℂ → ℂ
f : ℕ → ℂ
𝕜 : Type
inst✝ : _root_.RCLike 𝕜
hψ : Continuous ψ
x : ℝ
n : ℕ
⊢ Measurable fun u => ↑‖𝐞 (-(u * (1 / (2 * π) * (↑n / x).log))) • ψ u‖₊
n✝ : ℕ
A a b c d u x✝ y t σ' : ℝ
ψ Ψ : ℝ → ℂ
F G : ℂ → ℂ
f : ℕ → ℂ
𝕜 : Type
inst✝ : _root_.RCLike 𝕜
hψ : Continuous ψ
x : ℝ
n : ℕ
⊢ Measurable ⇑𝐞