1.To study combinatorial properties of discrete sequences by means of zeros of generating functions is an important topic in combinatorics.
通过发生函数的零点来研究离散序列的组合性质是组合学中的一个重要课题。
2.Hence it contains some new and important topics of combinatorics and graph theory.
因此选择的内容主要是当前组合数学与图论中研究的十分重要课题。