Critical exponents for groups of isometries
Critical exponents for groups of isometries
复制标题
等距群的临界指数
DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
Richard Sharp
中科院分区:
文献类型:
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作者:
Richard Sharp
Let Γ be a convex co-compact group of isometries of a CAT(−1) space X and let Γ0 be a normal subgroup of Γ. We show that, provided Γ is a free group, a sufficient condition for Γ and Γ0 to have the same critical exponent is that Γ / Γ0 is amenable.