In this paper, we study the condition which makes the fundamental group of graph have every positive integer as the index of some normal subgroup.

本文主要研究图的基本群的正规子群的指数何时成为任意正整数的条件。

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In this paper, we study the condition which makes the fundamental group of graph have every positive integer as the index of some normal subgroup.

本文主要研究图的基本群的正规子群的指数何时成为任意正整数的条件。

youdao