Orientation-reversing homeomorphisms in surface geography.
Three-manifolds and Kähler groups
We give a simple proof of a result originally due to Dimca and Suciu: a group that is both Kähler and the fundamental group of a closed three-manifold is finite. We also prove that a group that is both the fundamental group of a closed three-manifold and of a non-Kähler compact complex surface is or .
Instanton invariants of ...P2 via topology.
The deformation theory of anti-self-dual conformal structures.
Einstein metrics and smooth structures.
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