Open Gromov invariants and quantum Reidemeister torsion of Lagrangian submanifolds

Lagrangian Floer homology is an invariant associated to a Lagrangian L in a symplectic manifold.  I will explain how the vanishing of this homology leads to interesting count of open Gromov Witten invariants of L.  As this is not a symplectic seminar, quite some time will be spent on explaining all these notions.