کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4658550 | 1633100 | 2014 | 25 صفحه PDF | دانلود رایگان |
The fundamental group of the complement of a plane curve is a very important topological invariant. In particular, it is interesting to find out whether this group is determined by the combinatorics of the curve or not, and whether it is a direct sum of free groups and a free abelian group, or it has a conjugation-free geometric presentation.In this paper, we investigate the structure of this fundamental group when the graph of the conic-line arrangement is a unique cycle of length n and the conic passes through all the multiple points of the cycle. We show that if n is odd, then the affine fundamental group is abelian but not conjugation-free. For the even case, if n>4n>4, then using quotients of the lower central series, we show that the fundamental group is not a direct sum of a free abelian group and free groups.
Journal: Topology and its Applications - Volume 177, 1 November 2014, Pages 34–58