Invariants de certaines actions de lie instabilité du caractère Fredholm.
Invariants of translation surfaces
We definite invariants of translation surfaces which refine Veech groups. These aid in exact determination of Veech groups. We give examples where two surfaces of isomorphic Veech group cannot even share a common tree of balanced affine coverings. We also show that there exist translation surfaces of isomorphic Veech groups which cannot affinely cover any common surface. We also extend a result of Gutkin and Judge and thereby give the first examples of noncompact Fuchsian...
Involutions of 3-dimensional handlebodies
We study the orientation preserving involutions of the orientable 3-dimensional handlebody , for any genus g. A complete classification of such involutions is given in terms of their fixed points.
Involutions on Homotopy Spheres.
Involutions on Spheres and Mahowald's Root Invariant.
Involutions on tori with codimension-one fixed point set
The standard P. A. Smith theory of p-group actions on spheres, disks, and euclidean spaces is extended to the case of p-group actions on tori (i.e., products of circles) and coupled with topological surgery theory to give a complete topological classification, valid in all dimensions, of the locally linear, orientation-reversing, involutions on tori with fixed point set of codimension one.
Involutions with n-Dimensional Fixed-Sets.
Irreducibility of some representations of the groups of symplectomorphisms and contactomorphisms
We show the irreducibility of some unitary representations of the group of symplectomorphisms and the group of contactomorphisms.
Isolated fixed points of circle actions on 4-manifolds.
Jacobi actions of and on two Jacobi manifolds.
Jacobi Fields and Finsler Metrics on Compact Lie Groups with an Application to Differentiable Pinching Problems.
Jørgensen's inequality for discrete convergence groups.
Kazhdan constants for SL (3, Z).
Kazhdan groups acting on compact manifolds.
Klein Hyperbottle
Knots and Involutions.
Knots Fixed by Zp-Actions and Periodic Links.
La conjecture de Segal
Large automorphism groups of 16-dimensional planes are Lie groups.
Large group actions on manifolds.