Conferences - Seminars

  13:15-14:15 MA A1 10

In this talk I will introduce the chromatic number of a lattice: It is the least number of colors one needs to color the interiors of the cells of the Voronoi tessellation of a lattice so that no two cells sharing a facet are of the same color. I will introduce two lower bounds for ... Read more about "Coloring the Voronoi tessellation of lattices"
By Frank Vallentin (Universität zu Köln)
  15:00-17:00 CM 1 4

The developments of statistical mechanics and of quantum field theory are among the major achievements of 20th century's science. In the second half of the century, these two subjects started to converge, resulting in some of the most remarkable successes of mathematical physics. At the heart of this convergence lies the conjecture that critical lattice ... Read more about "Statistical Field Theory and the Ising Model"
By Prof. Clément Hongler
  16:15-17:15 CM 1 4

La classification par Breuil de ces représentations pour GL(2,Qp) a été le point de départ de la correspondance de Langlands p-adique reliant représentations de GL(2,Qp) et représentations du groupe de Galois absolu Gal de Qp. Elles correspondent aux représentations irréductibles de dimension 2 de Gal sur un corps de caractéristique p. Pourquoi ces représentations sont-elles ... Read more about "Existence de représentations supersingulières sur un corps de caractéristique p"
By Prof. Marie-France Vigneras
  09:00-17:00 BI A0 448

The study of measurable group actions on standard Borel spaces is of central importance both in descriptive set theory and ergodic theory. In recent years, the study of (definable) combinatorial structures (such as graphs, simplicial complexes, geometric objects...) has shown itself to be a powerful tool for understanding group actions and also to see what ... Read more about "Borel combinatorics and ergodic theory conference"
  17:15-18:15 BI A0 448

The combinatorics of abelian group actions on Polish spaces has been the subject of recent investigation, and is (somewhat surprisingly) interesting and non-trivial. If one considers the actions of Zn, we see a pattern develop: problems which are easy for n=1 become much more difficult for n at least 2. We discuss three example of ... Read more about "Professor Steve Jackson Bernoulli Lecture - Undecidability in the Theory of Abelian Group Actions"
By Steve Jackson (University of North Texas)    
  10:15-11:15 CM 0 12

In a seminal paper, Voevodsky introduced the smash-nilpotence equivalence relation on the group of algebraic cycles on a smooth projective variety. He also conjectured that the nilpotence equivalence corresponds to the classical numerical equivalence on cycles. More recently, Bernardara, Marcolli and Tabuada defined a noncommutative version of this conjecture for smooth and proper dg categories. ... Read more about "Topology Seminar: Classical and noncommutative Voevodsky's conjecture for cubic fourfolds and Gushel-Mukai fourfolds"
By Laura Pertusi (University of Milan)