Some topics concerning homeomorphic parameterizations.
In this survey, we consider several questions pertaining to homeomorphisms, including criteria for their existence in certain circumstances, and obstructions to their existence.
Some Topological Properties of Kähler Manifolds and Homogeneous Spaces.
Some topologically locally-flat surfaces in the complex projective plane.
Some Totally Real Embeddings of Three-Manifolds.
Some variants of Deligne-Grothendieck-MacPherson's natural transformation C* of Chern class.
Spaces of polynomials with roots of bounded multiplicity
We describe an alternative approach to some results of Vassiliev ([Va1]) on spaces of polynomials, by applying the "scanning method" used by Segal ([Se2]) in his investigation of spaces of rational functions. We explain how these two approaches are related by the Smale-Hirsch Principle or the h-Principle of Gromov. We obtain several generalizations, which may be of interest in their own right.
Space-time distributions.
Special Connections on Almost-Multifoliate Riemannian Manifolds.
Specialization of MacPherson's Chern classes.
Specialization of Segre classes of singular algebraic varieties.
Sphères d'homologie rationnelle
Sphères d'homotopie nouées
Spherical Fibrations and Manifolds.
Spin bordism and elliptic homology.
-structures and homotopy equivalences.
Spin c-Structures and S1-Actions.
Splitting obstructions and properties of objects in the Nil categories
We show that the objects of Bass-Farrell categories which represent 0 in the corresponding Nil groups are precisely those which are stably triangular. This extends to Waldhausen's Nil group of the amalgamated free product with index 2 factors. Applications include a description of Cappell's special UNil group and reformulations of those splitting and fibering theorems which use the Nil groups.
Splitting vector bundles by blowups
We show some advantages of splitting vector bundles by blowups.
Springer's Weyl Group Representations Through Characteristc Classes of Cone Bundles.
Stabile Foliations of 4-Manifolds by Closed Surfaces. I. Local Structure and Free Actions of Finite Cyclic and Dihedral Groups on Surfaces.