An L1 ergodic theorem with values in a non-positively curved space via a canonical barycenter map

Author:

NAVAS ANDRÉS

Abstract

AbstractWe give a general version of the Birkhoff ergodic theorem for functions taking values in non-positively curved spaces. In this setting, the notion of a Birkhoff sum is replaced by that of a barycenter along the orbits. The construction of an appropriate barycenter map is the core of this note. As a byproduct of our construction, we prove a fixed point theorem for actions by isometries on a Buseman space.

Publisher

Cambridge University Press (CUP)

Subject

Applied Mathematics,General Mathematics

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