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在得出图的树及树余间的一个数量关系后,引进了极树定义的一种新形式,得到了极树的几个充分条件,进而提供了一个生成极树的新方法。
After obtaining a quantitative relation between the tree and the tree, we introduce a new form of the definition of the polar tree and get several sufficient conditions of the polar tree, and then provide a new method to generate the polar tree.