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construct a function f defined in the compact interval $[0,1]$ of the real line that for some x irrational the limit:

$\lim\limits_{N \to \infty}\frac{1}{N}\sum\limits_{k=1}^{N} F(kx \bmod 1)\neq\int\limits_0^1F(t)dt$

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Hint: there are only countably many values $kx \mod 1$.

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