# Authors' names and institutions Arjeh M. Cohen (Eindhoven University of Technology, Netherlands) Sergei Haller (University of Sydney, Australia) Scott H. Murray (University of Sydney, Australia) # A short abstract of the paper The unipotent groups are an important class of algebraic groups. We show that techniques used to compute with finitely generated nilpotent groups carry over to unipotent groups. We concentrate particularly on the maximal unipotent subgroup of a split reductive group and show how this improves computation in the reductive group itself. # Current status: is it a preprint or a reprint? preprint