Curvature, tangentiality, and controlled topology.
Cyclic branched coverings of 2-bridge knots.
In this paper we study the connections between cyclic presentations of groups and the fundamental group of cyclic branched coverings of 2-bridge knots. Then we show that the topology of these manifolds (and knots) arises, in a natural way, from the algebraic properties of such presentations.
Cylindrical contact homology of subcritical Stein-fillable contact manifolds.
Die Existenz freier Zk-Operationen auf rationalen Homologiesphären.
Enquivariant Surgery on Incompressible Tori and Klein Bottles in 3-Manifolds with Respect to Involutions.
Equivariant surgery on essential annuli and Moebius bands in 3-manifolds with respect to involutions
Evaluation of the Transfer and the Universal Surgery Classes.
Fixed point free low dimensional real algebraic actions of A5 on contractible varieties.
Fold maps from the sphere to the plane.
Foliations and spinnable structures on manifolds
In this paper we study a new structure, called a spinnable structure, on a differentiable manifold. Roughly speaking, a differentiable manifold is spinnable if it can spin around a codimension 2 submanifold, called the axis, as if the top spins.The main result is the following: let be a compact -connected -dimensional differentiable manifold , then admits a spinnable structure with axis . Making use of the codimension-one foliation on , this yields that admits a codimension-foliation.
Free Cyclic Actions on Manifolds.
Geometrodynamics of wormholes
Heegaard splittings and Morse-Smale flows.
Higher simple structure sets of lens spaces with the fundamental group of arbitrary order
Extending work of many authors we calculate the higher simple structure sets of lens spaces in the sense of surgery theory with the fundamental group of arbitrary order. As a corollary we also obtain a calculation of the simple structure sets of the products of lens spaces and spheres of dimension grater or equal to .
Homotopy Triangulations of Pseudo Lens Spaces and Actions on Products of Spheres.
Imbeddings and homology cobordisms of lens spaces.
Infinite group actions on spheres.
This paper is mainly intended as a survey of the recent work of a number of authors concerning certain infinite group actions on spheres and to raise some as yet unanswered questions. The main thrust of the current research in this area has been to decide what topological and geometrical properties characterise the infinite conformal or Möbius groups. One should then obtain reasonable topological or geometrical restrictions on a subgroup G of the homeomorphism group of a sphere which will imply...
Infinitesimal computations in topology
Lefschetz fibrations on compact Stein surfaces.
Manifolds with a given homology and fundamental gorup.