Leibniz’s formula

Differentiating this equation (n -I- 1) times using Leibniz s formula (5.82), we obtain... 

Numerical Kekule Valence Structures. Kekule valence structures, like Clar s valence structures, may be viewed as geometrical formulas because they are drawn. Similarly, the novel notation for benzenoid hydrocarbons using an inscribed Greek jt represents a pictorial, qualitative, non-numerical representation of such molecules. However, well-designed or selected notation may have advantages that initially one did not anticipate. This has been the case with the Leibniz notation for derivatives in mathematics, and with graphical codes of configuration of /7-alkanes in structural chemistry. We will show now that the just introduced qualitative Jt-nota-... 

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