Averaging sequences and abelian rank in amenable groups

Details Averaging sequences and abelian rank in amenable groups Averaging sequences and abelian rank in amenable groups

2006-01-18

arxiv.org/abs/math/0601432v1

Mathematics

Dynamical Systems

7 pages; to appear in Israel Journal of Mathematics

Scientific paper

We investigate the connection between the abelian rank of a countable amenable group and the existence of good averaging sequences (e.g. for the pointwise ergodic theorem). We show that if $G$ is a group of abelian rank $r(G)$ then any Tempel'man sequence must have constant at least $2^{r(G)}$ and if $G$ is abelian this constant is achieved. On the other hand, infinite rank excludes the existence of Tempel'man sequences and forces all tempered sequences to grow super-exponentially.

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