Quandle-ring cocycle enhancement for prime knots up to 12 crossings

Let XX be a quandle and let ϕ:X×XA\phi:X\times X\to A be a 22-cocycle. Let

Y=I(Z2[X])Y=\mathcal{I}(\mathbb{Z}_2[X])

be the set of idempotents in the quandle ring Z2[X]\mathbb{Z}_2[X], assume that YY is a quandle, and let ψ:Y×YA\psi:Y\times Y\to A be a 22-cocycle. Quandle-ring enhancement conjecture. The cocycle invariant Ψ(Y,ψ)(K)\Psi_{(Y,\psi)}(K) is an enhancement of the cocycle invariant Φ(X,ϕ)(K)\Phi_{(X,\phi)}(K) for all prime oriented knots up to 12 crossings. The conjecture is based on computations distinguishing the listed knots and proposes that passing to idempotents in a quandle ring yields strictly more informative cocycle invariants in this range.

Sources & referencesView supporting material

Primary source

Mohamed Elhamdadi and Dipali Swain, “State sum invariants of knots from idempotents in quandle rings”, arXiv:2402.14661 (2024).

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