Möbius characterization of the boundary at infinity of rank one symmetric spaces

Möbius characterization of the boundary at infinity of rank one symmetric spaces
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一阶对称空间无穷远边界的莫比乌斯表征

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发表时间:
2012
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通讯作者:
V. Schroeder
V. Schroeder
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作者:
S. Buyalo;V. Schroeder

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抽象莫比乌斯结构(在集合 $$X$$X 上)是一类具有相同交叉比率的度量。如果莫比乌斯结构在反演操作下不变,则它是托勒密结构。 $$\mathrm{CAT }(-1)$$CAT(-1) 空间的无穷远边界自然是莫比乌斯空间,即托勒密空间。我们给出以下结果的自由分类证明,该结果纯粹用莫比乌斯几何来表征非紧型的一阶对称空间:设 $$X$$X 是紧致托勒密空间,其中包含托勒密圆并允许多次空间反转。那么 $$X$$X 就是莫比乌斯等效于一阶对称空间的无穷远边界。
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.