The equality of the finite groups Jnp,q\mathcal{J}_n^{p,q} and Knp,q\mathcal{K}_n^{p,q}

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Let pp and qq be the parameters defining the groups Jnp,q\mathcal{J}_n^{p,q} and Knp,q\mathcal{K}_n^{p,q} associated with the level-nn action on the binary tree. The preceding theorem establishes the inclusion Knp,q⊆Jnp,q\mathcal{K}_n^{p,q}\subseteq\mathcal{J}_n^{p,q}.

Equality conjecture. For all relevant nn, pp, and qq, one has

Jnp,q=Knp,q.\mathcal{J}_n^{p,q}=\mathcal{K}_n^{p,q}.

Computer calculations for (p,q)=(1,2)(p,q)=(1,2) and (3,2)(3,2) give matching group orders through n=12n=12, motivating the conjectured reverse inclusion. The source provides no proof of the equality.

References

Primary source

Noah MacAulay, “Group Theory of the Kolakoski Sequence”, arXiv:2605.14234 (2026).

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