Secondary cohomology and the Steenrod square.
Crossed extensions of algebras and Hochschild cohomology.
On the locally finite chain algebra of a proper homotopy type.
Hindernisse in dem Produkt von Suspensionen.
Identitäten für Whitehead-Produkte höherer Ordnung.
Iterierte Join-Konstruktionen.
Der Pontryagin-Ring von Quotienten eines Torus.
Rationale Homotopietypen.
Höhere Whitehead Produkte der zwei dimensionalen Sphäre
Relative Homotopiegruppen bei Abbildungskegeln
Relationen für primäre Homotopieoperationen und eine verallgemeinerte EHP-Sequenz
On the group of homotopy equivalences of simply connected five manifolds.
On the 2-type of an iterated loop space.
On the homotopy category of Moore spaces and the cohomology of the category of abelian groups
The homotopy category of Moore spaces in degree 2 represents a nontrivial cohomology class in the cohomology of the category of abelian groups. We describe various properties of this class. We use James-Hopf invariants to obtain explicitly the image category under the functor chain complex of the loop space.
Spaces associated to quadratic endofunctors of the category of groups.
Square groups are gadgets classifying quadratic endofunctors of the category of groups. Applying such a functor to the Kan simplicial loop group of the 2-dimensional sphere, one obtains a one-connected three-type. We consider the problem of characterization of those three-types X which can be obtained in this way. We solve this problem in some cases, including the case when π(X) is a finitely generated abelian group. The corresponding stable problem is solved completely.
Foncteurs polynomiaux et foncteurs de Mackey non linéaires
On décrit les foncteurs polynomiaux, des groupes abéliens libres vers les groupes abéliens, comme des diagrammes de groupes abéliens dont on explicite les relations.
Page 1