In chapter 2, we mainly inverstigate the number of spanning trees of composition of graphs and obtain some new results.
论文第二章主要研究了合成图的生成树计数问题,得到了一些新的结果。
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平图例子验证了构造定理和计数定理的实用性和有效性，是构造一个完全图的生成树的简单易行的方法。
Level diagram example shows the practicality and effectiveness of the construction theorem and counting theorem, which is a simple and easy method to construct a complete graph of the spanning tree.
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