中文

秩为二的自由群的等化子猜想

群论 2021-11-10 v3

摘要

一组同态 S:F(a,b)F(Δ)S: F(a, b)\rightarrow F(\Delta) 的 equaliser(等化子)在 SS 含有单射时秩至多为二,否则非有限生成。这证明了秩为二的自由群的 Stallings' Equaliser Conjecture(等化子猜想)的一种强形式。对于同态对 g,h:F(Σ)F(Δ)g, h:F(\Sigma)\rightarrow F(\Delta),当像在 F(Δ)F(\Delta) 中为非活跃子群或收缩时,也获得了相应结果。

关键词

引用

@article{arxiv.2003.05270,
  title  = {The equalizer conjecture for the free group of rank two},
  author = {Alan D. Logan},
  journal= {arXiv preprint arXiv:2003.05270},
  year   = {2021}
}

备注

19 pages. v2 incorporates minor edits (mostly typos). v3 is the final version accepted for publication, with improved structural and algorithmic results for retracts