L-space knots with tunnel number >1 by experiment

Chris Anderson, Kenneth L. Baker, Xinghua Gao, Marc Kegel, Khanh Le, Kyle Miller, Sinem Onaran, Geoffrey Sangston, Samuel Tripp, Adam Wood, Ana Wright

Research output: Contribution to journalArticlepeer-review


In Dunfield’s catalog of the hyperbolic manifolds in the SnapPy census which are complements of L-space knots in S, we determine that 22 have tunnel number 2 while the remaining all have tunnel number 1. Notably, these 22 manifolds contain 9 asymmetric L-space knot complements. Furthermore, using SnapPy and KLO we find presentations of these 22 knots as closures of positive braids that realize the Morton-Franks-Williams bound on braid index. The smallest of these has genus 12 and braid index 4.

Original languageEnglish (US)
JournalExperimental Mathematics
StateAccepted/In press - 2021


  • asymmetric
  • Braid
  • L-space knot
  • SnapPy

ASJC Scopus subject areas

  • Mathematics(all)


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