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 的 equaliser(等化子)在 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 ,当像在 中为非活跃子群或收缩时,也获得了相应结果。
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