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Dynamical systems on measure spaces, invariant measures, ergodic averages, mixing properties.

1 vote

Question about B. Host paper 'Nombres, normaux entropie, translations'

This relatively straight forward. The main observation is that, in the Host Meiri terminology, the $p^{N}$-cells are exactly the inverse image of the $p^{N-1}$-cells, and the $\times p$ map is $p$ to …
Asaf's user avatar
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3 votes
Accepted

Uniquely ergodicity and polynomial ergodic average

This is indeed true for some "nice systems", for example one can show this theorem (for say $L^{2}$-functions) for Kronecker systems simply by van-der-Corput trick. In general, those averages converg …
Asaf's user avatar
  • 2,459
6 votes

Examples of transformations that are totally ergodic but not weakly mixing?

Totally ergodic is equivalent to not having rational eigenvalues (I guess a suitable reference for this is Eli's book). Hence basically the Kronecker factor of such a system will be "essentially" the …
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2 votes
Accepted

Continuity of relative entropy with respect to the weak* topology

Now I'll post some sort of an answer, and not just a comment due to the length. Your first question is answered above. For the second one, if you're willing to take the minus inside (take the inverse …
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1 vote
Accepted

An angle between two vectors in Oseledets theorem

Ok, let take $v$ in the bundle at $x$. We may decompose $v=v^{u}+v^{s}\in E^{u}\oplus E^{s}$. Assume without loss of generality that $\lVert v\rVert=1$. Applying $A^{i}$, using equivariance and Osceld …
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5 votes

Book recommendation for ergodic theory and/or topological dynamics?

I second Siming Tu's recommendation for E-W book. It is a well balanced book (regarding theory vs applications), it has nice appendix contains relevant theory from functional analysis, and it contains …
4 votes

"Typical" convergence rate for the von Neumann mean ergodic theorem

In general, it varies. There are cases where the convergence is quite fast (for example in the case where the system is mixing, and say in the presence of spectral gap, think of Bernoulli system or sa …
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0 votes

Category Theory and Ergodic Theory

Well, because this thread resurrected, I think I should mention the recent work by Bader and Furman generalizing Margulis' superrigidity theorem (and one might say simplifying it). In their work, the …
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2 votes

Ratner's orbit closure for a unipotent semigroup

$\DeclareMathOperator\supp{supp}$The theorem holds for semigroups as well (well, in the finite volume setting! in the infinite volume setting there are subtleties between two-sided and one-sided avera …
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1 vote
Accepted

Compact group extension of a zero entropy system.

[I'm assuming G means K] In case the elements of K are not measure preserving, I doubt that the question is correct. In general, one can easily show that entropy decrease by moving into factors. Her …
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3 votes
Accepted

Furstenberg-Zimmer theorem: non-invertible systems

Posted as requested - consult the book by Manfred Einsiedler and Tom Ward - "Ergodic Theory with a view towards number theory" - published in GTM, especially in ch 7.
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10 votes
Accepted

Equidistibution of horocycles through Hecke eigenvalues of Maass cusp forms

There are two ways to solve this problem - one by ergodic methods, and the other one using purely harmonic methods. The harmonic method you are indicating is just to take the delta function of the po …
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11 votes
Accepted

Furstenberg $\times 2 \times 3$ conjecture, bibliography

Well that will be some lengthy answer. The first article that was published after the famous disjointness paper is another paper by Hillel called "Intersections of Cantor sets", it's related to the m …
1 vote
Accepted

Entropy equals zero?

EDIT - The answer below deals with an ergodic m.p.s As this question got up-voted, I've decided to fuly write a solution, based on the sketch I've made in the comments. Fix some $\varepsilon>0$ smal …
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4 votes

Hausdorff dimension of sequence space

This observation is attributed to H. Furstenberg, and appears (in the case of shift-invariant sets, i.e. Cantor sets) in his beautiful Disjointness paper (in section $3$, which you can read independen …
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