Previously, we discussed Eliashberg's cotangent bundle question: Are manifolds diffeomorphic if and only if their cotangent bundles are symplectomorphic?
Today, our focus shifts to Arnold's nearby Lagrangian conjecture:
Let $M$ be a compact smooth manifold. Then, every compact, orientable, exact Lagrangian submanifold $L \subset T^*M$ is Hamiltonian isotopic to the zero section $M \subset T^*M$.
The "Lie" group of symplectomorphisms and its "Lie" algebra, Symplectic isotopy, Hamiltonian isotopy