Hopf algebra structure on topological Hochschild homology.
Hopf algebras up to homotopy and the Bockstein spectral sequence.
Hopf diagrams and quantum invariants.
Hopf Structures on Stiefel Manifolds.
Hopf structures on the Borel subalgebra of
Hopf-bifurcation in systems with spherical symmetry. I: Invariant tori.
Hopfian and co-Hopfian objects.
The aim of the present paper is to study Hopfian and Co-Hopfian objects in categories like the category of rings, the module categories A-mod and mod-A for any ring A. Using Stone's representation theorem any Boolean ring can be regarded as the ring A of clopen subsets of compact Hausdorff totally disconnected space X. It turns out that the Boolean ring A will be Hopfian (resp. co-Hopfian) if and only if the space X is co-Hopfian (resp. Hopfian) in the category Top. For any compact Hausdorff space...
Hopfian and strongly hopfian manifolds
Let p: M → B be a proper surjective map defined on an (n+2)-manifold such that each point-preimage is a copy of a hopfian n-manifold. Then we show that p is an approximate fibration over some dense open subset O of the mod 2 continuity set C’ and C’ ∖ O is locally finite. As an application, we show that a hopfian n-manifold N is a codimension-2 fibrator if χ(N) ≠ 0 or
Horizontal forms of Chern type on complex Finsler bundles.
Horizontal lifts and foliations
Horizontal lifts of tensor fields and connections to the tangent bundle of higher order
How to Conjugate C1-Close Group Actions.
How to define the differentiable graph of a singular foliation
Hyperbolic 4-manifolds and conformally flat 3-manifolds
Hyperbolic 4-manifolds and tesselations
Hyperbolic characteristics on star-shaped hypersurfaces
Hyperbolic cone-manifolds with large cone-angles.
Hyperbolic covering knots.
Hyperbolic groups with low-dimensional boundary
Hyperbolic knots and cyclic branched covers.
We collect several results on the determination of hyperbolic knots by means of their cyclic branched covers. We construct examples of knots having two common cyclic branched covers. Finally, we briefiy discuss the problem of determination of hyperbolic links.