第三部分主要研究双圈图的谱矩的基本性质和谱矩序列排列的一些规律性结论。
Section Three provides the mainly results on the spectral moment of bicycle graphs and its lexicographical order.
研究了单圈图、双圈图的反比度，给出了它们的上下界并得到达到最大最小值的极图，还进一步给出多圈图的上下界的一个猜想。
In this paper, inverse degree of unicyclic graphs and bicyclic graphs is discussed, and the extremal graphs that reach the upper and lower bounds are given.
研究一类特殊的本原双色有向图，其未着色的有向图包含两个圈。
Special primitive two-colored digraphs whose uncolored digraph consist of two cycles are considered.
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