On functions with scattered spectra on lea groups
Paweł Głowacki (1981)
Studia Mathematica
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Paweł Głowacki (1981)
Studia Mathematica
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S. Doplicher, D. Kastler (1968)
Recherche Coopérative sur Programme n°25
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Isaac Kornfeld, Michael Lin (2000)
Studia Mathematica
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It is well known that a weakly almost periodic operator T in a Banach space is mean ergodic, and in the complex case, also λT is mean ergodic for every |λ|=1. We prove that a positive contraction on is weakly almost periodic if (and only if) it is mean ergodic. An example shows that without positivity the result is false. In order to construct a contraction T on a complex such that λT is mean ergodic whenever |λ|=1, but T is not weakly almost periodic, we prove the following: Let...
Charles Pugh, Michael Shub (1971)
Compositio Mathematica
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Emmanuel Lesigne (1995)
Commentationes Mathematicae Universitatis Carolinae
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If is a sequence of real numbers which is good for the ergodic theorem, is the sequence of the integer parts good for the ergodic theorem ? The answer is negative for the mean ergodic theorem and affirmative for the pointwise ergodic theorem.
Nishishiraho, Toshihiko (1998)
Journal of Convex Analysis
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Roger Jones (1980)
Studia Mathematica
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Dalibor Volný (1989)
Aplikace matematiky
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The author investigates non ergodic versions of several well known limit theorems for strictly stationary processes. In some cases, the assumptions which are given with respect to general invariant measure, guarantee the validity of the theorem with respect to ergodic components of the measure. In other cases, the limit theorem can fail for all ergodic components, while for the original invariant measure it holds.