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\\ ==== Next talks ====
[[en:seminaires:SeminaireThErgod:index|Ergodic theory seminar]]\\
Tuesday October 21, 2025, 10:30AM, Jussieu, Salle Paul Lévy, 16-26 209\\
**Matthew D. Foreman** (University of California, Irvine) //Impossibility results in Ergodic Theory//
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Impossibility results have played an
important role in mathematics, from questions like solutions of
polynomials, the word problem in group theory to non-measurable subsets of
$[0, 1]$. This talk will present new impossibility results about classical
problems in ergodic theory and dynamical systems. They answer questions
asked by von Neumann, Smale, Poincar\'e and others.
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Impossibility results have played an important role in mathematics, from questions like solutions of polynomials, the word problem in group theory to non-measurable subsets of [0, 1]. This talk will present new impossibility results about classical problems in ergodic theory and dynamical systems. They answer questions asked by von Neumann, Smale, Poincaré and others.

[[en:seminaires:SeminaireThErgod:index|Ergodic theory seminar]]\\
Tuesday December 16, 2025, 10:30AM, Jussieu, Salle Paul Lévy, 16-26 209\\
**Christophe Leuridan** (Université de Grenoble I) //Endomorphismes non dilatants du tore//
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On note η la mesure de Haar sur le tore Tᵈ. Tout endomorphisme surjectif T du groupe compact Tᵈ qui préserve la mesure de Haar est de la forme x ↦ Ax où A est une matrice à coefficients entiers de déterminant non nul. Les propriétés de T dépendent de la matrice A. En particulier, T est inversible si et seulement si |\det A| = 1, T est ergodique si et seulement si A n'a pas de valeur propre qui soit une racine de l'unité.

Nous nous intéressons à l'exactitude de T (la tribu asymptotique ∩ T⁻ⁿ(Tᵈ) est-elle triviale ?), au caractère Bernoulli de l'endomorphisme T et si oui, à la régularité du générateur.
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\\ ==== Previous talks ====
\\ === Year 2025 ===

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\\ === Year 2024 ===

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\\ === Year 2023 ===

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\\ === Year 2022 ===

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