Quadratic Diophantine equations and two generator Möbius groups
Quadratic Diophantine equations and two generator Möbius groups
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二次丢番图方程和两个生成莫比乌斯群
DOI:
10.1017/s1446788700000434
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发表时间:
1996
期刊:
影响因子:
--
通讯作者:
S. Tan
中科院分区:
文献类型:
--
作者:
Eng;S. Tan
Abstract In this paper, we study the set of rational μ in (−2, 2) for which the group Gu generated by is not free by using quadratic Diophantine equations of the form ax2 −by2 = ±1. We give a new set of accumulation points for rational values of μ in (−2, 2) for which Gμ is not free, thereby extending the results of Beardon where he showed that are accumulation points, where N is an integer which is not a perfect square. In particular, we exhibit an infinite set of accumulation points for μ between 1 and 2 including the point 1.