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arxiv: 1510.05423 · v4 · pith:DURX4X2Vnew · submitted 2015-10-19 · 🧮 math.GR

Kazhdan-Margulis theorem for Invariant Random Subgroups

classification 🧮 math.GR
keywords epsiloneverykazhdan-margulislatticestheoremactionsallowsapply
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Given a simple Lie group $G$, we show that the lattices in $G$ are weakly uniformly discrete. This is a strengthening of the Kazhdan-Margulis theorem. Our proof however is straightforward --- considering general IRS rather than lattices allows us to apply a compactness argument. In terms of p.m.p. actions, we show that for every $\epsilon$ there is an identity neighbourhood $U$ which intersects trivially the stabilizers of $1-\epsilon$ of the points in every non-atomic $G$-space.

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