Operations and co-operations in Morava -theory.
Operations and quantum doubles in complex oriented cohomology theory.
Opérations d'Adams en K-homologie et applications
Opérations d'Adams sur certains groupes de Grothendieck
Opérations géométriques en cobordisme complexe
Operazioni di Steenrod e teoria degli invarianti modulari per i primi dispari
Optimal bounds for the colored Tverberg problem
We prove a “Tverberg type” multiple intersection theorem. It strengthens the prime case of the original Tverberg theorem from 1966, as well as the topological Tverberg theorem of Bárány et al. (1980), by adding color constraints. It also provides an improved bound for the (topological) colored Tverberg problem of Bárány & Larman (1992) that is tight in the prime case and asymptotically optimal in the general case. The proof is based on relative equivariant obstruction theory.
P*-Invariant ideals in rings of invariants.
Points multiples isolés d'immersions de codimension quatre.
Polynomial algebras over the Steenrod algebra.
Polynomial algebras Which are Modules Over the mod-p Steenrod Algebra
Polynomial functors over finite fields
Polynomial operations on stable cohomotopy.
Postnikov invariants of H-spaces
It is known that the order of all Postnikov k-invariants of an H-space of finite type is finite. This paper establishes the finiteness of the order of the k-invariants of X in dimensions m ≤ 2n if X is an (n-1)-connected H-space which is not necessarily of finite type (n ≥ 1). Similar results hold more generally for higher k-invariants if X is an iterated loop space. Moreover, we provide in all cases explicit universal upper bounds for the order of the k-invariants of X.
Postnikov Towers Associated with Complex 2-Plane and Symplectic Line Bundles.
Problèmes d'existence et d'homotopie dans les feuilletages
Product structures in pyramids of higher order cohomology operations.
Profinite spaces and problems of realizability. (Espaces profinis et problèmes de réalisabilité.)
Projective k-invariants
Pyramids of higher order cohomology operations in the p-torsion-free category.