  Our main result is the $\mathcal{C}^0$-rigidity of the area spectrum and the
Maslov class of Lagrangian submanifolds. This relies on the existence of
punctured pseudoholomorphic discs in cotangent bundles with boundary on the
zero section, whose boundaries represent any integral homology class. We
discuss further applications of these punctured discs in symplectic geometry.

Symplectic Geometry