# How to get from representations to finite or infinitesimal transformations?

1. Sep 25, 2009

### confusio

Hi all. I have here a reference with a representation of the Lie algebra of my symmetry group in terms the fields in my Lagrangian. In order to calculate Noether currents, I would like to use this representation to derive formulae for the infinitesimal forms of the symmetry transformations described by the elements of the Lie algebra. I know how to get from the finite forms of the transformations to the infinitesimal ones, so those would be great too. Does anybody know how to get from the representation of the algebra to the actual transformations?