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arXiv 0912.4753math.LO
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O-极小结构中可定义群的Lie分解

Lie-like decompositions of groups definable in o-minimal structures

Annalisa Conversano

摘要:

在o-极小结构中可定义的群和实李群之间有很强的类比。然而,与实际情况不同,不是每个可定义群都有极大可定义紧子群。研究了非可定义紧的可定义群G,证明了G有唯一的极大正规可定义无挠子群N;商G/N总有极大可定义紧子群,且对任意的K,都有极大可定义无挠子群H,使得G/N可分解为G/N = KH,且K与H的交是平凡的.因此G是定义同伦等价于K。当G是可解的,则G/N已经是可定义紧的。在任何情况下(即使当G没有最大可定义的紧子群),我们发现一个可定义的李群分解G的最大环面的作用是发挥最大0-子群。

英文摘要:

There are strong analogies between groups definable in o-minimal structures and real Lie groups. Nevertheless, unlike the real case, not every definable group has maximal definably compact subgroups. We study definable groups G which are not definably compact showing that they have a unique maximal normal definable torsion-free subgroup N; the quotient G/N always has maximal definably compact subgroups, and for every such a K there is a maximal definable torsion-free subgroup H such that G/N can be decomposed as G/N = KH, and the intersection between K and H is trivial. Thus G is definably homotopy equivalent to K. When G is solvable then G/N is already definably compact. In any case (even when G has no maximal definably compact subgroup) we find a definable Lie-like decomposition of G where the role of maximal tori is played by maximal 0-subgroups.

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