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
DOI:
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发表时间:
2007
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影响因子:
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通讯作者:
Timothy C. Burness
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作者:
Timothy C. Burness
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.