Let f : P â†’Ö’ W be an embedding of a compact polyhedron in a closed oriented manifold W , let T be a regular neighborhood of P in W and let C := W r T be its complement. Then W is the homotopyâ€¦ (More)

We give homological conditions which determine sectional category, secat, for rational spherical fibrations. In the odd dimensional case the secat is the least power of the Euler class which isâ€¦ (More)

Invariants of t-structures and classification of nullity classes. Abstract We construct an invariant of t-structures on the derived category of a Noetherian ring. This invariant is complete whenâ€¦ (More)

We show that H-spaces with finitely generated cohomology, as an algebra or as an algebra over the Steenrod algebra, have homotopy exponents at all primes. This provides a positive answer to aâ€¦ (More)

The growing miniaturization demand of magnetic devices is fuelling the recent interest in bi-magnetic nanoparticles as ultimate small components. One of the main goals has been to reproduce practicalâ€¦ (More)

The rational homotopy type of a blow-up in the stable case. Abstract Suppose f : V â†’ W is an embedding of closed oriented manifolds whose normal bundle has the structure of a complex vector bundle.â€¦ (More)