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arXiv 1101.5705math.LOmath.GR
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可定义群的连通分支与o-极小Ⅰ

Connected components of definable groups and o-minimality I

Annalisa Conversano, Anand Pillay

摘要:

我们给出群G的例子,使得G^00不同于G^000。我们还证明了,对于群G可定义在一个O-极小结构,G有一个“有界轨道”当且仅当G是可定义的。这些结果回答了Gismatullin,Newelski,Petrykovski的问题。这些例子也给出了新的非G-紧一阶理论.

英文摘要:

We give examples of groups G such that G^00 is different from G^000. We also prove that for groups G definable in an o-minimal structure, G has a "bounded orbit" iff G is definably amenable. These results answer questions of Gismatullin, Newelski, Petrykovski. The examples also give new non G-compact first order theories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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