Moyennabilite interieure et extensions HNN
英文摘要：
We present sufficient conditions for HNN extensions to be inner amenable, respectively ICC, which give necessary and sufficient criteria among Baumslag-Solitar groups. We deduce that such a group, viewed as acting on its Bass-Serre tree, contains non trivial elements which fix unbounded subtrees.
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。
