On Asymptotic Cones and Quasi-isometry Classes of Fundamental Groups of 3-manifolds.
On boundary slopes of immersed incompressible surfaces
Let be a compact, orientable, irreducible 3-manifold with a torus. We show that there can be infinitely many slopes on realized by the boundary curves of immersed, incompressible, - incompressible surfaces in which are embedded in a neighborhood of .
On branched coverings of 3-manifolds which fiber over the circle.
On Branched Coverings of the 3-Sphere.
On central extensions of mapping class groups.
On compact subsets of an n-manifold
On contractible open 3-manifolds.
On Culler-Shalen seminorms and Dehn filling.
On Cyclic Branched Coverings of Spheres.
On Dihedral Covering Spaces of Knots.
On Embedded 2-Spheres in 3-Manifolds.
On finite type 3-mainfold invarinats II.
On for dimensional s-cobordisms, II.
On Heegaard Decompositions of Torus Knot Exteriors and Related Seifert Fibre Spaces.
On hyperbolic 3-manifolds obtained by Dehn surgery on links.
On low dimensional S-cobordisms.
On malnormal peripheral subgroups of the fundamental group of a -manifold
Let be a non-trivial knot in the -sphere, its exterior, its group, and its peripheral subgroup. We show that is malnormal in , namely that for any with , unless is in one of the following three classes: torus knots, cable knots, and composite knots; these are exactly the classes for which there exist annuli in attached to which are not boundary parallel (Theorem 1 and Corollary 2). More generally, we characterise malnormal peripheral subgroups in the fundamental group of a...
On manifold spines and cyclic presentations of groups
This is a survey of results and open problems on compact 3-manifolds which admit spines corresponding to cyclic presentations of groups. We also discuss questions concerning spines of knot manifolds and regular neighborhoods of homotopically PL embedded compacta in 3-manifolds.
On maximal fibred submanifolds of a knot exterior.
On McMullen's and other inequalities for the Thurston norm of link complements.