exceptional type
1.i, where g, v, dx, , and i are graph, exceptional, diagonal, extremal, central and inner automorphisms, respectively, of N, and that if Ann(2) = 0, the automorphism group Aut (N) = , where and 3 are the graph, diagonal, extremal, central and inner automorphism groups, respectively, of N, we also discuss the automorphism group of N generated by positive root vectors of chevalley algebra of type A1,A2.
