Gràcia, XavierPons Ràfols, Josep Maria2012-04-262012-04-2620000022-2488https://hdl.handle.net/2445/24572For a dynamical system defined by a singular Lagrangian, canonical Noether symmetries are characterized in terms of their commutation relations with the evolution operators of Lagrangian and Hamiltonian formalisms. Separate characterizations are given in phase space, in velocity space, and through an evolution operator that links both spaces. 2000 American Institute of Physics.19 p.application/pdfeng(c) American Institute of Physics, 2000Camps de galga (Física)Grups de LieTeoria quànticaGauge fields (Physics)Lie groupsQuantum theoryinfo:eu-repo/semantics/article185911info:eu-repo/semantics/openAccess