norm_num
𝕂 : Type u_1
inst✝ : _root_.RCLike 𝕂
Ψ : ℝ → ℝ
diffΨ : ContDiff ℝ 1 Ψ
suppΨ : Function.support Ψ ⊆ Icc (1 / 2) 2
σ₁ σ₂ : ℝ
σ₁pos : 0 < σ₁
f : ℝ → ℝ := fun x => ‖deriv Ψ x‖
cont : ContinuousOn f (Icc (1 / 2) 2)
⊢ (Icc (1 / 2) 2).Nonempty
no goals