  Floer cohomology groups are usually defined over a field of formal functions
(a Novikov field). Under certain assumptions, one can equip them with
connections, which means operations of differentiation with respect to the
Novikov variable. This allows one to write differential equations for Floer
cohomology classes. Here, we apply that idea to symplectic cohomology groups
associated to Lefschetz fibrations, and obtain a relation with enumerative
geometry.
