Geometric covering arguments and ergodic theorems for free groups

Details Geometric covering arguments and ergodic theorems for free groups Geometric covering arguments and ergodic theorems for free groups

2009-12-25

arxiv.org/abs/0912.4953v2

Mathematics

Dynamical Systems

In the second version one section was added, proving the pointwise ergodic theorems in L(1) for an amenable equivalence relati

Scientific paper

We present a new approach to the proof of ergodic theorems for actions of free groups based on geometric covering and asymptotic invariance arguments. Our approach can be viewed as a direct generalization of the classical geometric covering and asymptotic invariance arguments used in the ergodic theory of amenable groups. We use this approach to generalize the existing maximal and pointwise ergodic theorems for free group actions to a large class of geometric averages which were not accessible by previous techniques. Some applications of our approach to other groups and other problems in ergodic theory are also briefly discussed.

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