FUNDAMENTAL GROUP OF SEXTICS OF TORUS TYPE
FUNDAMENTAL GROUP OF SEXTICS OF TORUS TYPE
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环面六弦基本群
DOI:
10.1007/978-3-0348-8161-6_7
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
Duc Tai Pho
中科院分区:
文献类型:
--
作者:
M. Oka;Duc Tai Pho
We show that the fundamental group of the complement of any irreducible tame torus sextics in ℙ2is isomorphic to ℤ2* ℤ3except one class. The exceptional class has the configuration of the singularities {C3,9, 3A2} and the fundamental group is bigger than ℤ2* ℤ3. In fact, the Alexander polynomial is given by (t2−t+1)2. For the proof, we first reduce the assertion to maximal curves and then we compute the fundamental groups for maximal tame torus curves.