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Averages along cubes for not necessarily commuting measure preserving transformations

Idris Assani

math.DSarXiv:math/0511062

Abstract

We study the pointwise convergence of some weighted averages linked to averages along cubes. We show that if (X,B,μ, Ti) are not necessarily commuting measure preserving systems on the same finite measure space and if fi, 1≤ i≤ 6 are bounded functions then the averages 1N3Σn, m, p=1N f1(T1nx) f2(T2mx) f3(T3px) f4(T4n+mx) f5(T5n+px) f6(T6m+px) converge almost everywhere.

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