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S-unimodal Misiurewicz maps with flat critical points

Roland Zweimüller (2004)

Fundamenta Mathematicae

We consider S-unimodal Misiurewicz maps T with a flat critical point c and show that they exhibit ergodic properties analogous to those of interval maps with indifferent fixed (or periodic) points. Specifically, there is a conservative ergodic absolutely continuous σ-finite invariant measure μ, exact up to finite rotations, and in the infinite measure case the system is pointwise dual ergodic with many uniform and Darling-Kac sets. Determining the order of return distributions to suitable reference...

Support overlapping L 1 contractions and exact non-singular transformations

Michael Lin (2000)

Colloquium Mathematicae

Let T be a positive linear contraction of L 1 of a σ-finite measure space (X,Σ,μ) which overlaps supports. In general, T need not be completely mixing, but it is in the following cases: (i) T is the Frobenius-Perron operator of a non-singular transformation ϕ (in which case complete mixing is equivalent to exactness of ϕ). (ii) T is a Harris recurrent operator. (iii) T is a convolution operator on a compact group. (iv) T is a convolution operator on a LCA group.

Sur la cohomologie dans les schémas de Bernoulli

Thierry de la Rue (2000)

Colloquium Mathematicae

We introduce an invariant of cohomology in Bernoulli shifts, which is used to answer a question about cohomology of Hölder functions with finitary functions whose coding time is integrable. When restricted to the class of Hölder functions, this invariant even provides a criterion of cohomology.

Sur la convergence faible des systèmes dynamiques échantillonnés

Nadine Guillotin-Plantard (2004)

Annales de l’institut Fourier

Soit T α la rotation sur le cercle d’angle irrationnel α , soit ( S k ) k 0 une marche aléatoire transiente sur . Soit f L 2 ( μ ) et H ] 0 , 1 [ , nous étudions la convergence faible de la suite 1 n H k = 0 [ n t ] - 1 f T α S k , n 1 .

Sur le codage du flot géodésique dans un arbre

Anne Broise-Alamichel, Frédéric Paulin (2007)

Annales de la faculté des sciences de Toulouse Mathématiques

Étant donné un arbre T et un groupe Γ d’automorphismes de T , nous étudions les propriétés markoviennes du flot géodésique sur le quotient de l’espace des géodésiques de T par Γ . Par exemple, quand T est l’arbre de Bruhat-Tits d’un groupe algébrique linéaire connexe semi-simple G ̲ de rang 1 sur un corps local non archimédien K ^ et si Γ est un réseau (éventuellement non uniforme) dans G ̲ ( K ^ ) , nous montrons que l’action des puissances paires de la transformation géodésique est Bernoulli d’entropie finie sur...

Sur les processus quasi-Markoviens et certains de leurs facteurs

Thierry de la Rue (2005)

Colloquium Mathematicae

We study a class of stationary finite state processes, called quasi-Markovian, including in particular the processes whose law is a Gibbs measure as defined by Bowen. We show that, if a factor with integrable coding time of a quasi-Markovian process is maximal in entropy, then this factor splits off, which means that it admits a Bernoulli shift as an independent complement. If it is not maximal in entropy, then we can find a splitting finite extension of this factor, which generalizes a theorem...

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