近似群I：无挠无挠的幂零情形
Approximate groups, I: the torsion-free nilpotent case
摘要：
我们描述了无挠的的幂零群的"K-近似子群"的结构，特别注意李群。另外三个作品，由费舍尔-卡茨-彭，桑德斯和陶，出现了独立解决相关问题。我们简要地评论这些文件之间的一些连接。
英文摘要：
We describe the structure of ``K-approximate subgroups'' of torsion-free nilpotent groups, paying particular attention to Lie groups. Three other works, by Fisher-Katz-Peng, Sanders and Tao, have appeared which independently address related issues. We comment briefly on some of the connections between these papers.
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。
