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The tame automorphism group of an affine quadric threefold acting on a square complex

Cinzia BisiJean-Philippe FurterStéphane Lamy — 2014

Journal de l’École polytechnique — Mathématiques

We study the group Tame ( SL 2 ) of tame automorphisms of a smooth affine 3 -dimensional quadric, which we can view as the underlying variety of SL 2 ( ) . We construct a square complex on which the group admits a natural cocompact action, and we prove that the complex is CAT ( 0 ) and hyperbolic. We propose two applications of this construction: We show that any finite subgroup in Tame ( SL 2 ) is linearizable, and that Tame ( SL 2 ) satisfies the Tits alternative.

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