Dear R.N. Tsai, Unfortunately in GAP there is no algorithm implemented to find the centre of a universal enveloping algebra of a split semisimple Lie algebra. The only algorithm that I know for this purpose constructs a set of linear equations for the generators of the centre. However, for all but a few small cases that is very inefficient, as the number of equations quickly becomes huge.
Sorry for not being able to help more. Best wishes, Willem de Graaf _______________________________________________ Forum mailing list [email protected] http://mail.gap-system.org/mailman/listinfo/forum
