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math.DG2003
Nonnegative curvature, symmetry and fundamental group
Igor Belegradek
We prove a result on equivariant deformations of flat bundles, and as a corollary, we obtain two ``splitting in a finite cover'' theorems for isometric group actions on Riemannian…
math.GR2003
On co-Hopfian nilpotent groups
Igor Belegradek
We characterize co-Hopfian finitely generated torsion free nilpotent groups in terms of their Lie algebra automorphisms, and construct many examples of such groups.