Finite-index subgroup conjecture for bounded nonsolvable definable subgroups of SL2SL_2

Let KK be a pp-adically closed field and let HH be a definable subgroup of SL2(K)SL_2(K). Assume that HH is bounded and nonsolvable, and that ww does not normalize HH. Let Γ\Gamma and Hγ,η,ηH_{\gamma,\eta,\eta} be as in the statement. Finite-index subgroup conjecture. Up to conjugacy, there exist γ,η1,η2Γ\gamma,\eta_1,\eta_2\in\Gamma such that Hγ,η,ηH_{\gamma,\eta,\eta} is a subgroup of HH of finite index at most 2(p1)2(p-1) if p2p\neq 2, or at most 44 if p=2p=2. This gives a uniform finite-index description of bounded nonsolvable definable subgroups of SL2(K)SL_2(K) under the stated non-normalization hypothesis; the supplied text does not establish whether the claim is resolved.

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Primary source

Benjamin Druart, “Definable subgroups in SL\_2 over a p-adically closed field”, arXiv:1501.06834 (2015).

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