Lionel Pournin - Talks

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Talks

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Seminars

Eccentricities in the flip-graphs of convex polygons
Geometry and topology seminar
University of Luxembourg, April 30, 2018

From mesh generation to associahedra and related structures
Séminaire de Géométrie Algorithmique et Combinatoire
Institut Henri Poincaré, Paris, April 20, 2017

An application of civil engineering to surface topology
Industrial Optimization Seminar
Fields Institute, Toronto, Canada, February 28, 2017

The flip operation: from data storage to surface topology
Seminar of the department of Computing and Software
McMaster University, Hamilton, Canada, December 5, 2016

Géométrie des graphes de flips de surfaces orientables
Séminaire Algorithmique
LIGM, Université Paris-Est, March 10, 2015

Le diamètre asymptotique des associaèdres genéralisés
Séminaire de combinatoire
LIPN, Université Paris 13, December 2, 2014

Géométrie des graphes de flips de surfaces orientables
Third meeting of the ANR EGOS
Université de Bordeaux, November 6, 2014

Le diamètre asymptotique des associaèdres genéralisés
Journée du projet Émergences Combinatoire à Paris
Université Paris Diderot, November 3, 2014

Sur les diamètres de certains graphes de flips
Séminaire de combinatoire
LIPN, Université Paris 13, May 6, 2014

Sur les diamètres de certains graphes de flips
Séminaire Algorithmique, Combinatoire et Recherche Opérationnelle
LIF, Université d'Aix-Marseille, January 13, 2014

Maximal flip distances on fancy surfaces
Séminaire de Combinatoire énumérative et analytique
LIAFA, Université Paris Diderot, May 30, 2013

The diameters of associahedra
Séminaire de l'équipe combinatoire
LIX, École Polytechnique, April 15, 2013

Spheropolyhedra: versatile particle shapes for granular media simulation
Theoretisch-physikalisches Seminar
University of Göttingen, Germany, April 9, 2013

Recent results on flip-graphs
Oberseminar Geometrie
University of Fribourg, Switzerland, December 12, 2012

The diameters of associahedra - [slides]
Seminar of the Talgo team
École Normale Supérieure, Paris, December 7, 2012

The diameters of associahedra
Séminaire de Combinatoire Algébrique et Géométrique
Université Pierre et Marie Curie, Paris, November 8, 2012

Mathematical tools for the numerical simulation of granular media
Journée de séminaires sur l'optimisation
LIX, École Polytechnique, November 7, 2012

Le diamètre des associaèdres
Séminaire de Combinatoire énumérative et analytique
LIAFA, Université Paris Diderot, October 18, 2012


65000 spheres of different radii moving under the action of gravity. The center of the spheres are constrained to stay in a vertical plane with periodic boundary conditions on the horizontal axis. Colors indicate the speeds.

Conferences

On the diameter of lattice polytopes
Workshop on discrete geometry
Oberwolfach, Germany, April 14, 2017

Improved bounds on the diameter of lattice polytopes
2016 Canadian Mathematical Society Winter Meeting
Niagara Falls, Canada, December 3, 2016

A combinatorial method to find sharp lower bounds on flip distances
25th International Conference on Formal Power Series and Algebraic Combinatorics - FPSAC 2013
Paris, June 28, 2013

The flip-graph of the 4-dimensional cube is connected
21st International Symposium on Mathematical Programming - ISMP 2012
Berlin, August 20, 2012

From spheres to spheropolyhedra: generalized distinct element methodology and algorithm analysis
Bonn Workshop on Combinatorial Optimization
Bonn, November 4, 2008

A generalization of Distinct Element Method to three-dimensional particles with complex shapes
Thematic meeting on discrete simulations
Institut Henri Poincaré, Paris, March 16-18, 2005

Molecular-dynamics force models for better control of energy dissipation in numerical simulations of dense granular media
Workshop on the Quasi-Static Deformations of Particulate Materials - QuaDPM'03
Budapest, August 25-28, 2003