2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231037We define new Hamiltonian isotopy invariants for a monotone Lagrangian torus embedded in a symplectic 4-manifold. We show that, in the standard symplectic 4-space, these invariants distinguish a monotone Clifford torus from a Chekanov torus.More typos and minor mistakes corrected. To appear in Math. Res. Lett.Symplectic GeometryGeometric Topology53D12; 57R52; 57R17text