Polynomial expressions for the hyper-Wiener index of extended hydrocarbon networks.
General expressions are derived for the hyper-Wiener index (WW) for several series of hydrocarbons, both benzenoid and non-benzenoid, including some two-dimensional networks. Indeed, such expressions were found for all but one series studied. Methods are also described for eliminating the register overflow problem that besets computer-based approaches to calculating WW for large structures by means of the distance matrix.
Cash
G G
GG
Risk Assessment Division, New Chemicals Screening and Assessment Branch, United States Environmental Protection Agency, Washington, DC 20460, USA. cash.gordon@epa.mail