Scindements de Heegaard des espaces lenticulaires
Some generalized Coxeter groups and their orbifolds.
In this note we construct examples of geometric 3-orbifolds with (orbifold) fundamental group isomorphic to a (Z-extension of a) generalized Coxeter group. Some of these orbifolds have either euclidean, spherical or hyperbolic structure. As an application, we obtain an alternative proof of theorem 1 of Hagelberg, Maclaughlan and Rosenberg in [5]. We also obtain a similar result for generalized Coxeter groups.
Some remarks concerning the covering numbers of closed manifolds.
Splitting the spectral flow and the Alexander matrix.
Stabilisation, bordism and embedded spheres in 4-manifolds.
Stability of the homology of the moduli spaces of Riemann surfaces with spin structure.
Stabilization for the automorphisms of free groups with boundaries.
Sur la théorie élémentaire des groupes libres
Sela a annoncé une solution complète d’un problème de Tarski, qui demanda vers 1945 quels sont les groupes de type fini qui ont la même théorie élémentaire qu’un groupe libre. Nous discuterons des travaux de Remeslennikov, Kharlampovich-Myasnikov, Sela, Champetier-Guirardel et autres sur la structure des groupes limites (les groupes de type fini qui sont “limites”de groupes libres, ou encore, qui ont la même théorie universelle qu’un groupe libre). Nous indiquerons quelques outils utilisés par Sela...
Surfaces and the Second Homology of a Group.
The algebraic geometry of representation spaces associated to Seifert fibered homology 3-spheres.
The arithmetic hyperbolic 3-manifold of smallest volume
The disjoint curve property.
The extended complexity of three-manifolds.
The Geometry of Self-adjunction
The Kazhdan property of the mapping class group of closed surfaces and the first cohomology group of its cofinite subgroups.
The mapping class group of a genus two surface is linear.
The metric space of geodesic laminations on a surface. I.
Three-manifolds having complexity at most 9.
Travaux de Thurston sur les groupes quasi-fuchsiens et les variétés hyperboliques de dimension fibrées sur
Twisted quandle homology theory and cocycle knot invariants.