Bondarenko, Vitalij M.
(Луганский национальный университет им. Т. Шевченко, 2004)
Let denote an extended Dynkin diagram with vertex set 0 = {0, 1, . . . , n}. For a vertex i, denote by S(i) the set of vertices j such that there is an edge joining i and j; one assumes
the diagram has a unique vertex ...