Shapes of hyperbolic triangles and once-punctured torus groups
Shapes of hyperbolic triangles and once-punctured torus groups
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双曲三角形和一次穿孔环面群的形状
DOI:
10.1007/s00209-021-02745-3
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发表时间:
2021
影响因子:
0.8
通讯作者:
Gao, Xinghua
中科院分区:
文献类型:
--
作者:
Kim, Sang-hyun;Koberda, Thomas;Lee, Jaejeong;Ohshika, Ken’ichi;Tan, Ser Peow;Gao, Xinghua
Letbe a hyperbolic triangle with a fixed area. We prove that for all but countably many, generic choices ofhave the property that the group generated by the-rotations about the midpoints of the sides of the triangle admits no nontrivial relations. By contrast, we show for all, a dense set of triangles does afford nontrivial relations, which in the generic case map to hyperbolic translations. To establish this fact, we study the deformation spaceof singular hyperbolic metrics on a torus with a single cone point of angle, and answer an analogous question for the holonomy mapof such a hyperbolic structure. In an appendix by Gao, concrete examples ofandare given where the image of eachis finitely presented, non-free and torsion-free; in fact, those images will be isomorphic to the fundamental groups of closed hyperbolic 3-manifolds.
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DOI:
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发表时间:
1982
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2008
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S.Albeverio;S.Liang;S.Liang;T.Nakanishi;中西敏浩;名和範人;服部哲弥;服部哲弥;名和範人;服部久美子;中西敏浩
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