Minimal-diagram bridge-number realization conjecture for knots

Let KK be a knot. Let C(K)\mathcal{C}(K) denote the set of crossing-number minimizing diagrams of KK, and let B(K)\mathcal{B}(K) denote the set of diagrams of KK realizing its bridge number.

Minimal-diagram bridge-number realization conjecture. For any knot KK,

C(K)B(K).\mathcal{C}(K)\cap\mathcal{B}(K)\ne\emptyset.

The conjecture asserts that every knot has a crossing-number minimizing diagram whose bridge number is realized. It is proposed after examples showing that some minimal diagrams can have Wirtinger number strictly larger than the knot's bridge number, while an alternative minimal diagram realizes the bridge number.

Sources & referencesView supporting material

Primary source

Ryan Blair, Alexandra A. Kjuchukova and Makoto Ozawa, “The incompatibility of crossing number and bridge number for knot diagrams”, arXiv:1710.11327 (2017).

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