Évènements

Conférence "Numeration 2026"

Catégorie d'évènement : Analyse et théorie des nombres Date/heure : 1 juin 2026 - 5 juin 2026 00:00-23:59 Lieu : Amphithéâtre 8 Oratrice ou orateur : Résumé :

Numeration 2026 is the 2026 edition of a series of events around numeration systems and substitution systems. The central themes of this conference include (but are not limited to): number theory, diophantine approximation, fractal geometry, substitutions, combinatorics on words, ergodic theory, dynamical systems, and theoretical computer science.

Découvrir le programme
—  Conference website —
https://numeration2026.sciencesconf.org/

— Invited speakers (confirmed) —
Michael Baake, Bielefeld University, Germany
Ayreena Bakhtawar, Polish Academy of Sciences, Poland
Colin Faverjon, University of Picardy Jules Verne, Amiens, France
Lukas Spiegelhofer, Technical University of Leoben, Austria
Manon Stipulanti, University of Liège, Belgium

— Scientific Committee —
– Shigeki Akiyama, University of Tsukuba, Japan
– Valérie Berthé, IRIF, France
– Charlene Kalle, University of Leiden, Netherlands
– Lingmin Liao, University of Wuhan, China
– Edita Pelantová, Czech Technical University, Czech Republic
– Michel Rigo, University of Liège, Belgium
– Wolfgang Steiner, IRIF, France
– Cathy Swaenepoel, University of Paris Cité, France
– Jörg Thuswaldner, Technical University of Leoben, Austria

— Organizing Committee — 
– Cécile Dartyge (IECL, University of Lorraine, France)
– Damien Jamet (LORIA, University of Lorraine, France)
– Manfred Madritsch (Technical University of Leoben, Austria)
– Thomas Stoll (IECL, University of Lorraine, France)

— Past editions —
The previous « Numeration » conferences have been in:
– Tsukuba (2025)
– Utrecht (2024)
– Liège (2023, 2011)
– Vienna (2019)
– Paris (2018)
– Rome (2017)
– Prague (2016, 2008)
– Nancy (2015)
– Debrecen (2014)
– Kyoto (2012)
– Leiden (2010)
– Marseille (2009)
– Graz (2007)
– Grenoble (2005)

Reunion d'equipe

Catégorie d'évènement : Groupe de travail Probabilités et Statistique Date/heure : 4 juin 2026 09:15-10:15 Lieu : Salle de conférences Nancy Oratrice ou orateur : Pascal Moyal Résumé :

Skew-symmetric schemes for robust SDE sampling

Catégorie d'évènement : Séminaire Probabilités et Statistique Date/heure : 4 juin 2026 10:45-11:45 Lieu : Salle de conférences Nancy Oratrice ou orateur : Giorgos Vasdekis (Newcastle University) Résumé :
We propose a new simple and explicit numerical scheme for time-homogeneous stochastic differential equations (SDEs), focusing on the case where the drift does not satisfy the Lipschitz property. The scheme is based on sampling increments at each time step from a skew-symmetric probability distribution, with the level of skewness determined by the drift and volatility of the underlying process. We show that as the step-size decreases the scheme converges weakly to the SDE of interest. We then consider the problem of simulating from the limiting distribution of an ergodic SDE using the numerical scheme with a fixed step-size. We establish conditions under which the numerical scheme converges to equilibrium at a geometric rate, and quantify the bias between the equilibrium distributions of the scheme and of the true diffusion process. Our results are supported via numerical simulations, which indicate that the schemes possess a robustness property with respect to different step-sizes.
This is joint work with Y. Iguchi, S. Livingstone, N. Nusken and R. Zhang

Pause pour SL2R à Reims

Catégorie d'évènement : Séminaire Théorie de Lie, Géométrie et Analyse Date/heure : 4 juin 2026 14:15-15:15 Lieu : Oratrice ou orateur : Résumé :