ABSTRACT
NBMO is equal to the number No in the Huckel spectrum [56]. Thus, the enumeration of No is reduced to a determination of the number of independent parameters in NBMO which satisfy the zero-sum rule. The application of this method is illustrated for s-indacene (Figure 4). The procedure is as follows: eq. (58) is stepwise satisfied for each vertex of a graph G. Vertices for which the zero-sum rule is executed are denoted by black dots (•).
