The braid-index–bridge-index conjecture for positive braid knots

Let KK be a positive braid knot, meaning a knot represented as the closure of a braid whose crossings are all positive. Let b(K)b(K) denote its bridge index and β(K)\beta(K) its braid index. The positive braid knot index conjecture. The braid index and bridge index of KK agree, that is, β(K)=b(K)\beta(K)=b(K). This extends the corresponding prediction for L-space knots to positive braid knots; the supplied text gives no resolution, so the conjecture remains open.

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Primary source

Siddhi Krishna and Hugh Morton, “Twist positivity, L-space knots, and concordance”, arXiv:2211.17109 (2025).

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