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arxiv: 1903.03570 · v1 · pith:WOKWXT6Vnew · submitted 2019-03-08 · 🧮 math.LO

Definable Topological Dynamics of SL₂(mathbb{C}((t))

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keywords groupdefinablemathbbdynamicsgroupsminimalsuitabletopological
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We initiate a study of definable topological dynamics for groups definable in metastable theories. Specifically, we consider the special linear group $G = SL_2$ with entries from $M = \mathbb{C}((t))$; the field of formal Laurent series with complex coefficients. We prove such a group is not definably amenable, find a suitable group decomposition, and describe the minimal flows of the additive and multiplicative groups of $\mathbb{C}((t))$. The main result is an explicit description of the minimal flow and Ellis Group of $(G(M),S_G(M))$ and we observe that this is not isomorphic to $G/G^{00}$, answering a question as to whether metastability is a suitable weakening of a conjecture of Newelski.

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