Fractal uncertainty in higher dimensions
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Problem statement
Notes: Unavailable.
Source: A. Cohen, `Fractal uncertainty in higher dimensions`, Annals of Math, 202 (1) 2025. Statement taken from https://github.com/ImperialCollegeLondon/AnnalsChallenge (v1.0.0, e32eb14), AnnalsChallenge/AnnalsOfMathematics/2025-202-1-FractalUncertainty.lean
Informal solution: Unavailable.
theorem theorem_1_1 (ν : ℝ) (hν₀ : 0 < ν) :
∃ (β C : ℝ), β > 0 ∧ C > 0 ∧ ∀ (h : ℝ) (X Y : Set ℝᵈ)
(hX : MeasurableSet X) (hY : MeasurableSet Y), h ∈ Set.Ioo 0 (1 / 100) →
X ⊆ FractalUncertainty.cube (-1) 1 → FractalUncertainty.PorousOnBalls ν h 1 X → Y ⊆ FractalUncertainty.cube (-h⁻¹) h⁻¹ →
FractalUncertainty.PorousOnLines ν 1 h⁻¹ Y → ∀ (f : Lp ℂ 2), (𝓕 f : Lp ℂ 2) =ᵐ[volume.restrict Yᶜ] 0 →
(eLpNorm (X.indicator f) 2).toReal ≤ C * h ^ β * ‖f‖ := d:ℕν:ℝhν₀:0 < ν⊢ ∃ β C,
β > 0 ∧
C > 0 ∧
∀ (h : ℝ) (X Y : Set ℝᵈ),
MeasurableSet X →
MeasurableSet Y →
h ∈ Set.Ioo 0 (1 / 100) →
X ⊆ cube (-1) 1 →
PorousOnBalls ν h 1 X →
Y ⊆ cube (-h⁻¹) h⁻¹ →
PorousOnLines ν 1 h⁻¹ Y →
∀ (f : ↥(Lp ℂ 2 volume)),
↑↑(𝓕 f) =ᵐ[volume.restrict Yᶜ] 0 → (eLpNorm (X.indicator ↑↑f) 2 volume).toReal ≤ C * h ^ β * ‖f‖
All goals completed! 🐙