An $L^1$ counting problem in ergodic theory

Details An $L^1$ counting problem in ergodic theory An $L^1$ counting problem in ergodic theory

2003-07-30

arxiv.org/abs/math/0307384v1

Mathematics

Dynamical Systems

34 pages, 2 figures

Scientific paper

We solve the following counting problem for measure preserving
transformations. For $f\in L_+^1(\mu)$, is it true that $\ds
\sup_n\frac{\bN_n(f)(x)}{n} <\infty,$ where $$\ds\bN_n(f)(x)= # {k: \frac{f(T^k
x)}{k}>\frac 1 n}?$$ One of the consequences is the nonvalidity of J.
Bourgain's Return Time Theorem for pairs of $(L^1, L^1)$ functions.

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