Dear Forum We can access the Weyl groups of different types of semi-simple Lie groups in GAP. Is it possible to get the Matrix form of Weyl groups of reductive Lie groups? For example can we compute the matrix form of Weyl group of Genereral Linear group Gl(n)? because its Weyl group will consists n x n matrices contrary to Sl(n) who's Wyel group is given by (n-1) x (n-1) matrices. Regards Imran Qureshi _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum