Hello all, Could someone explain me please how does the GAP represent root systems? I'd like to have representation as in Bourbaki IV-VI chapters (tables at the end of the book). For example, any root of A_n is of the form e_i - e_j.
For A_3 positive roots subsystem GAP gives me these vectors: [ [ 2, -1, 0 ], [ -1, 2, -1 ], [ 0, -1, 2 ], [ 1, 1, -1 ], [ -1, 1, 1 ], [ 1, 0, 1 ] ]. What do they mean? Thanks. _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
