INFINITESIMAL SYMMETRIES OF HALL EFFECT ON RIEMANN SURFACES Antonio L\'opez Almorox and Carlos Tejero Prieto Key words: Hall effect, Calculus of variations, Poincar\'e-Cartan form, Symmetries, Riemann surfaces. 1991 Math. Subject Classification: 49S05, 53C80, 58D19, 70H33. Abstract: The aim of this paper is to give a geometrical formulation of Hall effect on Riemann surfaces. In our approach magnetic Hall fields are characterized solely in terms of a given riemannian metric. Infinitesimal symmetries and their associated Noether invariants are explicitly computed in genus g using the Poincar\'e-Cartan form.