The horospherical geometry of surfaces in hyperbolic 4-space

The horospherical geometry of surfaces in hyperbolic 4-space
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DOI:
10.1007/bf02773613
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发表时间:
2002-12
影响因子:
1
通讯作者:
S. Izumiya;D. Pei;M. Fuster
S. Izumiya;D. Pei;M. Fuster
中科院分区:
数学2区
文献类型:
--
作者:
S. Izumiya;D. Pei;M. Fuster

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本文研究了H +4(−1)中与超球面接触有关的一些几何性质。我们引入密切超半球,horobinormals,horoasymptomatic方向和horospheric点的概念,并提供条件,确保它们的存在。证明了全半脐曲面具有正交的时渐近方向。
We study some geometrical properties associated to the contacts of surfaces with hyperhorospheres inH+4(−1). We introduce the concepts of osculating hyperhorospheres, horobinormals, horoasymptotic directions and horospherical points and provide conditions ensuring their existence. We show that totally semiumbilical surfaces have orthogonal horoasymptotic directions.