# GAP versus SageMath for branching to Lie subgroups

Which computer package is better, GAP or SageMath, for decomposing an irreducible representation of a (simple) Lie group $$G$$ into representations of a Lie subgroup. I am most interested when branching to Levi, or parabolic, subgroups.

• I haven't used it, but SageMath comes with an interface to LiE. Run sage -i lie to install it. In a perfect world, this would interact well with the rest of SageMath. – John Palmieri Mar 11 at 16:58