PDF(346 KB)
On the Index of the Normal Subgroups of Fundamental Groups of Graph
Wei ZHOU(1); Wu Jie SHI(2)
Acta Mathematica Sinica, Chinese Series ›› 2007, Vol. 50 ›› Issue (4) : 797-800.
PDF(346 KB)
PDF(346 KB)
On the Index of the Normal Subgroups of Fundamental Groups of Graph
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