Gauge groups and topological invariants of vacuum manifolds
Generalized Hénon difference equations with delay.
Generalized manifolds ANR's and AR's and null decompositions of manifolds
Geometrical arguments concerning two-sided submanifolds, flat submanifolds and pinched bicollars
Geometrie Classification of Simplicial Structures on Topologieal Manifolds.
Group-theoretic conditions under which closed aspherical manifolds are covered by Euclidean space
Hass, Rubinstein, and Scott showed that every closed aspherical (irreducible) 3-manifold whose fundamental group contains the fundamental group of a closed aspherical surface, is covered by Euclidean space. This theorem does not generalize to higher dimensions. However, we provide geometric tools with which variations of this theorem can be proved in all dimensions.