A continuous φ: T → T satisfies φ(x) = w x + t with w integer if the A(T)-norm of exp(-2π i z φ) is O(log^{1/8-ε} |z|) as |z| → ∞.
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The quantitative Beurling-Helson Theorem
A continuous φ: T → T satisfies φ(x) = w x + t with w integer if the A(T)-norm of exp(-2π i z φ) is O(log^{1/8-ε} |z|) as |z| → ∞.