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arXiv · 1501.05820

The subgroup $PSL(2,R)$ is spherical in the group of diffeomorphisms of the circle

Yury A. Neretin
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Abstract

We show that the group $PSL(2,R)$ is a spherical subgroup in the group of $C^3$-diffeomorphisms of the circle. Also, the group of automorphisms of a Bruhat--Tits tree is a spherical subgroup in the group of hierarchomorphisms of the tree.

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Yury A. Neretin. 2015-01-23. The subgroup $PSL(2,R)$ is spherical in the group of diffeomorphisms of the circle. https://doi.org/10.4213/faa3227%2C%2010.1007%2Fs10688-016-0143-2

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