Michael Usher
Princeton University
Symplectic four-manifolds with torsion first Chern class
Abstract: While new examples of exotic symplectic four-manifolds of various descriptions continue to be produced at a rapid rate, the set of known symplectic four-manifolds whose first Chern class is torsion is still fairly small and has received no new additions since 1992. I'll discuss evidence for and against the belief that the known examples might in fact be the only ones.