Rodríguez Abella, Álvaro Leok, Melvin 2025-09-25T08:41:22Z 2025-09-25T08:41:22Z 2023-02-22 1941-4889 https://doi.org/10.3934/jgm.2023013 Artículos en revistas . This paper develops the theory of discrete Dirac reduction of discrete Lagrange–Dirac systems with an abelian symmetry group acting on the configuration space. We begin with the linear theory and, then, we extend it to the nonlinear setting using retraction compatible charts. We consider the reduction of both the discrete Dirac structure and the discrete Lagrange–Pontryagin principle, and show that they both lead to the same discrete Lagrange–Poincaré–Dirac equations. The coordinatization of the discrete reduced spaces relies on the notion of discrete connections on principal bundles. At last, we demonstrate the method obtained by applying it to a charged particle in a magnetic field, and to the double spherical pendulum. application/pdf en-GB Creative Commons Reconocimiento-NoComercial-SinObraDerivada España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Revista: Journal of Geometric Mechanics, Periodo: 1, Volumen: 15, Número: 1, Página inicial: 319, Página final: 356 Discrete Dirac reduction of implicit Lagrangian systems with abelian symmetry groups info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/openAccess . discrete mechanical systems, geometric numerical integration, Lagrange–Poincaré–Dirac equations, reduction by symmetries