Erratum to 'Rational Lie Algebras and p-Isomorphisms of Nilpotent Groups and Homotopy Types'
Extension of complexes of groups
Complexes of groups over ordered simplicial complexes are generalizations to higher dimensions of graphs of groups. We first relate them to complexes of spaces by considering their classifying space . Then we develop their homological algebra aspects. We define the notions of homology and cohomology of a complex of groups with coefficients in a -module and show the existence of free resolutions. We apply those notions to study extensions of complexes of groups with constant or abelian kernel....
Failure of the Dehn Lemma on Contractible 4-Manifolds.
Generalization of a theorem by V. Eberhard
Hyperspaces of CW-complexes
It is shown that the hyperspace of a connected CW-complex is an absolute retract for stratifiable spaces, where the hyperspace is the space of non-empty compact (connected) sets with the Vietoris topology.
Identitäten für Whitehead-Produkte höherer Ordnung.
Inverse limits of simplicial complexes
Klein Hyperbottle
La structure des copolyèdres au sens de Stamm.
L’espace classifiant de la -théorie algébrique
Locally compact spaces C-tame at infinity.
Locally Compact Spaces ℓ-Tame At Infinity
Minimality of toric arrangements
We prove that the complement of a toric arrangement has the homotopy type of a minimal CW-complex. As a corollary we deduce that the integer cohomology of these spaces is torsionfree. We apply discrete Morse theory to the toric Salvetti complex, providing a sequence of cellular collapses that leads to a minimal complex.
Nearly regular cell-decompositions of orientable 2-manifolds with at most two exceptional cells
Normalidad en realizaciones generalizadas (RY (X)).
On a class of spaces for which the fixed-point property is characterized by homology groups
On a problem of S. Ulam concerning Cartesian squares of 2-dimensional polyhedra
On classification of -manifolds according to genus
On decomposition of polyhedra into a Cartesian product of 1-dimensional and 2-dimensional factors
On homotopy types of 2-dimensional polyhedra