2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53323Time does not obviously appear amongst the coordinates on the constrained phase space of general relativity in the Hamiltonian formulation. Recent work in finite-dimensional models claims that topological obstructions generically make the global definition of time impossible. It is shown here that a time coordinate can be globally defined on a constrained phase space by patching together local time coordinates, just as coordinates are defined on topologically non-trivial manifolds.8 pp., McGill 92-15High Energy Physics - Theorytext