On the topology of compact affine manifolds

Details On the topology of compact affine manifolds On the topology of compact affine manifolds

2005-11-11

arxiv.org/abs/math/0511303v3

Mathematics

Differential Geometry

Incomplete

Scientific paper

Geodesically complete affine manifolds are quotients of the Euclidean space through a properly discontinuous action of a subgroup of affine Euclidean transformations. An equivalent definition is that the tangent bundle of such a manifold admits a flat, symmetric and complete connection. If the completeness assumption is dropped, the manifold is not necessarily obtained as the quotient of the Euclidean space through a properly discontinuous group of affine transformations. In fact the universal cover may no longer be the Euclidean space. The main result of this paper states that all compact affine manifolds have 0 Euler characteristic and that the fundamental group of these manifolds is non-trivial.

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