Möbius characterization of the boundary at infinity of rank one symmetric spaces
Möbius characterization of the boundary at infinity of rank one symmetric spaces
复制标题
一阶对称空间无穷远边界的莫比乌斯表征
DOI:
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发表时间:
2012
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通讯作者:
V. Schroeder
中科院分区:
文献类型:
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作者:
S. Buyalo;V. Schroeder
Abstract Möbius structure (on a set $$X$$X) is a class of metrics having the same cross-ratios. A Möbius structure is Ptolemaic if it is invariant under inversion operations. The boundary at infinity of a $$\mathrm{CAT }(-1)$$CAT(-1) space is in a natural way a Möbius space, which is Ptolemaic. We give a free of classification proof of the following result that characterizes the rank one symmetric spaces of noncompact type purely in terms of their Möbius geometry: Let $$X$$X be a compact Ptolemy space which contains a Ptolemy circle and allows many space inversions. Then $$X$$X is Möbius equivalent to the boundary at infinity of a rank one symmetric space.