Some nonreduced moduli of bundles and Donaldson invariants for Dolgachev surfaces.
Some non-trivial PL knots whose complements are homotopy circles
We show that there exist non-trivial piecewise linear (PL) knots with isolated singularities , n ≥ 5, whose complements have the homotopy type of a circle. This is in contrast to the case of smooth, PL locally flat, and topological locally flat knots, for which it is known that if the complement has the homotopy type of a circle, then the knot is trivial.
Some partial formulae for Stiefel-Whitney classes of Grassmannians
Some partitions consisting of Jordan curves.
Some PL involutions of product 3-manifolds which preserve the center of the fundamental group
Some Pontrjagin Rings. II.
Some properly critical subsets of Euclidean spaces.
Some Properties of a Cohomology Group Associated to a Totally Geodesic Foliation.
Some properties of stable rank 2 bundles on algebraic surfaces.
Some rational computations of the Waldhausen algebraic K theory.
Some recent results on surfaces of general type
Some remarks concerning the covering numbers of closed manifolds.
Some Remarks on Analytic Foliations and Analytic Branched Coverings.
Some remarks on conjugacy classes of bundle Gauge groups
Some remarks on foliated S1 bundles.
Some remarks on -actions with sections
Some remarks on Koszul algebras and quantum groups
The category of quadratic algebras is endowed with a tensor structure. This allows us to construct a class of Hopf algebras studied recently under the name of quantum (semi) groups.
Some remarks on Lie flows.
The first part of this paper is concerned with geometrical and cohomological properties of Lie flows on compact manifolds. Relations between these properties and the Euler class of the flow are given.The second part deals with 3-codimensional Lie flows. Using the classification of 3-dimensional Lie algebras we give cohomological obstructions for a compact manifold admits a Lie flow transversely modeled on a given Lie algebra.
Some remarks on symplectic actions of compact groups.
Some remarks on the discrete Morse-Smale characteristic.