The realization problem for J?rgensen numbers

The realization problem for J?rgensen numbers
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J?rgensen 数的实现问题

DOI:
10.1090/ecgd/331
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发表时间:
2019
期刊:
Conformal Geometry and Dynamics of the American Mathematical Society
影响因子:
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通讯作者:
Yamazaki Ryosuke
Yamazaki Ryosuke
中科院分区:
--
文献类型:
--
作者:
Yamashita Yasushi;Yamazaki Ryosuke

文献摘要

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设是的一个双生成元子群。的Jørgensen数定义为\[J(G)=\inf\{|\mathrm {tr}^ 2 A-4| +|\mathrm {tr}[A,B]-2|\:;\:G=\langle A,B\rangle\}。如果是非初等Kleinian群,则。这个不等式称为Jørgensen不等式。在本文中,我们证明了,对于任何,存在一个非初等Kleinian群,其Jørgensen数等于。这回答了Oichi和Sato提出的一个问题。我们还提出了我们的计算机生成的图片,估计Jørgensen数从上面的肖特基空间的对角线切片。引用
Letbe a two-generator subgroup of. The Jørgensen numberofis defined by\[J (G)=\inf\{|\mathrm {tr}^ 2 A-4|+|\mathrm {tr}[A, B]-2|\:;\: G=\langle A, B\rangle\}.\] Ifis a non-elementary Kleinian group, then. This inequality is called Jørgensen’s inequality. In this paper, we show that, for any, there exists a non-elementary Kleinian group whose Jørgensen number is equal to. This answers a question posed by Oichi and Sato. We also present our computer generated picture which estimates Jørgensen numbers from above in the diagonal slice of Schottky space. References