Bridge-number conjecture for spiral knots

For a spiral knot S(p,q,ε)S(p,q,\varepsilon), let b(S(p,q,ε))b(S(p,q,\varepsilon)) denote its bridge number, and let min(p,q)\min(p,q) be the minimum of its two integer parameters. Bridge-number conjecture. Every spiral knot satisfies

b(S(p,q,ε))=min(p,q).b(S(p,q,\varepsilon))=\min(p,q).

The formula holds for the examples and families discussed in the paper and is also known for torus knots. The conjecture proposes that it holds for all spiral knots; its general validity remains open.

Sources & referencesView supporting material

Primary source

Sarah Blackwell, Ashish Das, Sydney Mayer, Luke Moyar, Faisal Quraishi and Ryan Stees, “Classical invariants of spiral knots”, arXiv:2506.17889 (2025).

Additional references

2 papers in this index state this conjecture (2022–2025). The statement above is taken from the most recent of them; the others are arXiv:2208.09032.

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