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Noncommutative maximal ergodic theorems

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arxiv math/0505308 v2 pith:T3TZ6GEG submitted 2005-05-14 math.OA math.DSmath.FA

Noncommutative maximal ergodic theorems

classification math.OA math.DSmath.FA
keywords ergodicmaximalnoncommutativetheoremsanaloguecontractionsinequalitypositive
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This paper is devoted to the study of various maximal ergodic theorems in noncommutative $L_p$-spaces. In particular, we prove the noncommutative analogue of the classical Dunford-Schwartz maximal ergodic inequality for positive contractions on $L_p$ and the analogue of Stein's maximal inequality for symmetric positive contractions. We also obtain the corresponding individual ergodic theorems. We apply these results to a family of natural examples which frequently appear in theory of von Neumann algebras and in quantum probability.

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