Llosa, JosepCruz Pérez, Javier de2014-11-182014-11-182014-01https://hdl.handle.net/2445/59748Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutor: Josep LlosaWe discuss systems subject to constraints. We review Dirac's classical formalism of dealing with such problems and motivate the de nition of objects such as singular and nonsingular Lagrangian, rst and second class constraints, and the Dirac bracket. We show how systems with rst class constraints can be considered to be systems with gauge freedom. We conclude by studing a classical example of systems with constraints, electromagnetic eld5 p.application/pdfengcc-by-nc-nd (c) Cruz Pérez, 2014http://creativecommons.org/licenses/by-nc-nd/3.0/es/Teoria de sistemesEquacions de LagrangeTreballs de fi de grauSystem theoryLagrange equationsBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess