On a simple invariant of Turaev-Viro type
On a Theorem of Barden.
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 Cartesian factors and the topological classification of linear metric spaces
On CE-images of the Hubert cube and characterization of Q-manifolds
On central extensions of mapping class groups.
On classification of -manifolds according to genus
On closed 4-manifolds admitting a Morse function with 4 critical points
On closed sets with convex projections in Hilbert space
Let k be a fixed natural number. We show that if C is a closed and nonconvex set in Hilbert space such that the closures of the projections onto all k-hyperplanes (planes with codimension k) are convex and proper, then C must contain a closed copy of Hilbert space. In order to prove this result we introduce for convex closed sets B the set consisting of all points of B that are extremal with respect to projections onto k-hyperplanes. We prove that is precisely the intersection of all k-imitations...
On compact subsets of an n-manifold
On condition of a stratified mapping
For a stratified mapping , we consider the condition concerning the kernel of the differential of . We show that the condition is equivalent to the condition which has a more obvious geometric content.
On construction of signature of quadratic forms on infinite-dimensional abstract spaces.
On contractible open 3-manifolds.
On convex metric spaces II
On Countable Dense and Strong Local Homogeneity
We present an example of a connected, Polish, countable dense homogeneous space X that is not strongly locally homogeneous. In fact, a nontrivial homeomorphism of X is the identity on no nonempty open subset of X.
On Culler-Shalen seminorms and Dehn filling.
On Cyclic Branched Coverings of Spheres.