Some slides

• Histoires de polyèdres, a general audience talk given in a high school (in Albi), Dec. 12, 2005.
  Content: old and new results about 3-dimensional polyhedra, from Pythagoras to the Bellows conjecture, and beyond.
• Les motifs de cercles et la géométrie hyperbolique : mini-cours, shown at the "Journées de Géométrie Algorithmique", 01-02/2006. Partie 1, Partie 2.
  Presents in a fairly general way results on circle patterns, and gives some broad ideas of the proofs, using them as an excuse to explain some basic points of 3-dimensional hyperbolic geometry. Designed for an audience closer to computer science than to hyperbolic geometry.
• Motifs de cercles sur les surfaces singulières, colloquium talk at the Institut Fourier, Grenoble, Feb. 16, 2006.
  Same as above but shorter and for a general mathematical audience.
• Minimal surfaces in constant curvature 3-manifolds, talk at the Newton Institute, Oct. 12, 2005.
  Some recent results, mostly joint work with Kirill Krasov, on some geometric properties of AdS manifolds with cone singularities along time-like lines.
• Variétés de dimension 3 avec particules, Darboux seminar, Montpellier, Dec. 16, 2005.
  Same as above but with extension in various directions, esp. 3-dimensional hyperbolic geometry, and in french.
• On the rigidity of weakly convex polyhedra, Geometry and topology seminar, U. Penn, Apr. 17,2008.
• Higher Schläfli formulas, Geometry seminar, Cornell U., Apr. 28,2008.
• Problèmes anciens et nouveaux sur les polyèdres euclidiens. Colloquium du département de mathématiques de Nantes, Apr. 8, 2010. handout version or exposition version. In english (except the title).