English

Tangle replacements and knot Floer homology torsions

Geometric Topology 2024-10-18 v1

Abstract

We show that the torsion order Ord(K)\mathrm{Ord}(K) of a knot KK in knot Floer homology gives a lower bound on the minimum number nn such that an oriented (n+1)(n+1)-tangle replacement unknots KK. This generalizes earlier results by Alishahi and the author and by Juhasz, Miller and Zemke, that Ord(K)\mathrm{Ord}(K) is a lower bound for both the unknotting number u(K)u(K) and for br(K)1br(K)-1, where br(K)br(K) denotes the bridge index of KK.

Keywords

Cite

@article{arxiv.2410.13283,
  title  = {Tangle replacements and knot Floer homology torsions},
  author = {Eaman Eftekhary},
  journal= {arXiv preprint arXiv:2410.13283},
  year   = {2024}
}

Comments

6 pages, 1 figure