With the introduction of the concept of polynomial tree, the article studies the construction problem of polynomial basis from a broader sense of perspective.
作者在第一章提出了多项式树的概念，给基函数的构造找到一条直观的思路。
Using it the directed tree polynomial of a directed graph G can be found conveniently and efficiently.
应用它可以方便且有效地求出一个有向图G的有向树多项式。
In this paper we study such a special case: a tree network with all sources on a path and we present its polynomial-time algorithms.
本文研究了这样的特殊情形：树网络上所有起点处于同一条路上，建立了多项式时间算法。
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