On finite subgroups of groups of type VF.
On Fox's theory of overlays
On framed links of Peiffer identities
On general dissections of a polygon.
On general dissections of a polygon. (Short Communication).
On groups generated by two positive multi-twists: Teichmüller curves and Lehmer's number.
On groups with linear sci growth
We prove that the semistability growth of hyperbolic groups is linear, which implies that hyperbolic groups which are sci (simply connected at infinity) have linear sci growth. Based on the linearity of the end-depth of finitely presented groups we show that the linear sci is preserved under amalgamated products over finitely generated one-ended groups. Eventually one proves that most non-uniform lattices have linear sci.
On Heegaard Decompositions of Torus Knot Exteriors and Related Seifert Fibre Spaces.
On homotopy types of 2-dimensional polyhedra
On hyperbolic 3-manifolds obtained by Dehn surgery on links.
On hyperbolic 3-manifolds realizing the maximal distance between toroidal Dehn fillings.
On irreducible, infinite, nonaffine Coxeter groups
The following results are proved: The center of any finite index subgroup of an irreducible, infinite, nonaffine Coxeter group is trivial; Any finite index subgroup of an irreducible, infinite, nonaffine Coxeter group cannot be expressed as a product of two nontrivial subgroups. These two theorems imply a unique decomposition theorem for a class of Coxeter groups. We also prove that the orbit of each element other than the identity under the conjugation action in an irreducible, infinite, nonaffine...
On irregular links at infinity of algebraic plane curves.
On iterated torus knots and transversal knots.
On J.H.C. Whitehead's aspherical question I.
On Khovanov's categorification of the Jones polynomial.
On Klein Surfaces and Dihedral Groups.
On knot Floer homology and cabling.
On linked Jordan curves in
On links with one codimension two compontent.