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Denjoy–Koksma inequality : ウィキペディア英語版
Denjoy–Koksma inequality
In mathematics, the Denjoy–Koksma inequality, introduced by as a combination of work of Arnaud Denjoy and the Koksma–Hlawka inequality of Jurjen Ferdinand Koksma, is a bound for Weyl sums \sum_^f(x+k\omega) of functions ''f'' of bounded variation.
==Statement==

Suppose that a map ''f'' from the circle ''T'' to itself has irrational rotation number ''α'', and ''p''/''q'' is a rational approximation to ''α'' with ''p'' and ''q'' coprime, |''α'' – ''p''/''q''| < 1/''q''2. Suppose that ''φ'' is a function of bounded variation, and ''μ'' a probability measure on the circle invariant under ''f''. Then
:\left|\sum_^ \phi f^i(x) - q\int_T \phi \, d\mu \right| < \operatorname(\phi)

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