中文

On T-positive links

几何拓扑 2026-05-12 v1

摘要

T-positive links form a subset of strongly quasipositive links that strictly contains the set of all non-split braid positive links. Analogous to Baader's characterisation of positive links as precisely the strongly quasipositive and homogeneous links, we show that T-positive links are precisely the strongly quasipositive links that are the closures of T-homogeneous braids. This complements previous characterizations of T-positive links by Rudolph and Banfield as links arising as boundaries of positive Hopf-plumbed baskets, or closures of staircase braids. We examine the behavior of T-positive links under cabling operations and connected sums, and demonstrate that all strongly quasipositive, fibered knots with at most 12 crossings are T-positive. Additionally, we compare T-positivity with other positivity notions for links and compile open questions.

关键词

引用

@article{arxiv.2605.10502,
  title  = {On T-positive links},
  author = {Benjamin Bode and Paula Truöl},
  journal= {arXiv preprint arXiv:2605.10502},
  year   = {2026}
}

备注

23 pages, 18 figures including 2 flowcharts, 1 table. Comments welcome!