In this paper, we study the condition which makes the fundamental groupofgraph 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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Here's an example: unorganized data, such as a groupof measurements, is usually processed in some manner to make it easily readable for users, such as a graph or a chart.