| 翻訳と辞書 | Denjoy–Koksma inequality| Denjoy–Koksma inequality  : ウィキペディア英語版 | 
 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  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
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