A Height Gap Theorem For Finite Subsets Of GL_d(ar{Q}) and Non Amenable Subgroups
A Height Gap Theorem For Finite Subsets Of GL_d(ar{Q}) and Non Amenable Subgroups
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GL_d(ar{Q})有限子集和不服从子群的高度间隙定理
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发表时间:
2008
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通讯作者:
E. Breuillard
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作者:
E. Breuillard
We show a global adelic analog of the classical Margulis Lemma from hyperbolic geometry. We introduce a conjugation invariant normalized height $hat{h}(F)$ of a finite set of matrices $F$ in $GL_{n}(ar{Bbb{Q}})$ which is the adelic analog of the minimal displacement on a symmetric space. We then show, making use of theorems of Bilu and Zhang on the equidistribution of Galois orbits of small points, that $hat{h}(F)>epsilon $ as soon as $F$ generates a non-virtually solvable subgroup of $SL_{n}(ar{Bbb{Q}}),$ where $epsilon =epsilon (n)>0$ is an absolute constant.