五元素链是一类由若干个五边形构成的连通图.本文主要研究了五元素链在不同构联接位下的Merri-field-Simmons指标,并给出了相应的递推公式.
Five-membered chains is a kind of connected graph that consists of several pentagons.This paper mainly discusses the Merrifield-Simmons index of five-membered chains under don' t isomorphic connected positions,and the recurrence formulas are given.