Les sections secrètes des tores simples dans l'espace euclidien IR 3 telles que Kuiper les dévoile à Hirzebruch.
Levelling an unknotting tunnel.
Lie ideals and Jordan triple derivations in rings
Lifting of homeomorphisms to branched coverings of a disk
We consider a simple, possibly disconnected, d-sheeted branched covering π of a closed 2-dimensional disk D by a surface X. The isotopy classes of homeomorphisms of D which are pointwise fixed on the boundary of D and permute the branch values, form the braid group Bₙ, where n is the number of branch values. Some of these homeomorphisms can be lifted to homeomorphisms of X which fix pointwise the fiber over the base point. They form a subgroup of finite index in Bₙ. For each equivalence class...
Light paths with an odd number of vertices in polyhedral maps
Let be a path on vertices. In an earlier paper we have proved that each polyhedral map on any compact -manifold with Euler characteristic contains a path such that each vertex of this path has, in , degree . Moreover, this bound is attained for or , even. In this paper we prove that for each odd , this bound is the best possible on infinitely many compact -manifolds, but on infinitely many other compact -manifolds the upper bound can be lowered to .
L'image d'un groupe dans un groupe hyperbolique.
Limit groups and groups acting freely on -trees.
Limit groups for relatively hyperbolic groups. II: Makanin-Razborov diagrams.
Limit sets of free convergence groups.
Limits of (certain) CAT(0) groups. I: Compactification.
Line Bundles over Framed Manifolds.
Line Fields with Branch Defects.
Linear representations of the group of conjugating automorphisms and the braid groups of some manifolds.
Link bordism skein modules
We compute link bordism skein modules of colored oriented links in oriented 3-manifolds. A Hurewicz theorem relating link bordism and link homotopy skein modules is proved.
Link concordance and algebraic closure, II.
Link concordance, homology cobordism, and Hirzebruch-type defects from iterated p-covers
Link concordance implies link homotopy.
Link concordance invariants and homotopy theory.
Link genus and the Conway moves.
Link homology and Frobenius extensions
We explain how rank two Frobenius extensions of commutative rings lead to link homology theories and discuss relations between these theories, Bar-Natan theories, equivariant cohomology and the Rasmussen invariant.