Affine Surfaces With a Huge Group of Automorphisms

Affine Surfaces With a Huge Group of Automorphisms
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具有大量自同构的仿射曲面

DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
A. Dubouloz
A. Dubouloz
中科院分区:
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文献类型:
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作者:
J. Blanc;A. Dubouloz

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本文描述了一类有理仿射曲面S的自同构群:Aut(S)的所有代数子群生成的Aut(S)的正规子群Aut(S)alg不是由这类子群的任何可数族生成的,而商Aut(S)/Aut(S)alg包含一个不可数生成元集上的自由群.
We describe a family of rational affine surfaces S with huge groups of automorphisms in the following sense: the normal subgroup Aut(S)alg of Aut(S) generated by all algebraic subgroups of Aut(S) is not generated by any countable family of such subgroups, and the quotient Aut(S)/Aut(S)alg cointains a free group over an uncountable set of generators.