Representations of some lattices into the group of analytic diffeomorphisms of the sphere $\mathbb{S}^2$

Details Representations of some lattices into the group of analytic diffeomorphisms of the sphere $\mathbb{S}^2$ Representations of some lattices into the group of analytic diffeomorphisms of the sphere $\mathbb{S}^2$

2011-12-28

arxiv.org/abs/1112.6115v1

Mathematics

Group Theory

Scientific paper

In \cite{Ghys} it is proved that any morphism from a subgroup of finite index of $\mathrm{SL}(n,\mathbb{Z})$ to the group of analytic diffeomorphisms of $\mathbb{S}^2$ has a finite image as soon as $n\geq 5$. The case $n=4$ is also claimed to follow along the same arguments; in fact this is not straightforward and this case indeed needs a modification of the argument. In this paper we recall the strategy for $n\geq 5$ and then focus on the case $n=4$.

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