On base sizes for actions of finite classical groups

On base sizes for actions of finite classical groups
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关于有限经典群作用的基本尺寸

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发表时间:
2007
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通讯作者:
Timothy C. Burness
Timothy C. Burness
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作者:
Timothy C. Burness

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设G是一个有限的几乎单经典群,Ω是一个忠实的本原非标准G-集。Ω的一个子集是G的一个基,如果它在G中的点态稳定子是平凡的。设B(G)是G的基的最小尺寸.卡梅隆和坎特的一个著名猜想断言,存在一个绝对常数c,使得对于所有这样的群G,B(G)使c倾斜,并且这样一个待定常数的存在性已经由Liebeck和Shalev建立。本文证明了B(G)≥ 4,或G = U6(2)· 2,Gω = U4(3)· 22,B(G)= 5.证明是概率性的,使用不动点比率的界限。
Let G be a finite almost simple classical group and let Ω be a faithful primitive non‐standard G‐set. A subset of Ω is a base for G if its pointwise stabilizer in G is trivial. Let b(G) be the minimal size of a base for G. A well‐known conjecture of Cameron and Kantor asserts that there exists an absolute constant c such that b(G) ⩽ slant c for all such groups G, and the existence of such an undetermined constant has been established by Liebeck and Shalev. In this paper we prove that either b(G) ⩽ 4, or G = U6(2) · 2, Gω = U4(3) · 22 and b(G) = 5. The proof is probabilistic, using bounds on fixed point ratios.