The uniform-slicing conjecture for alphabet-multiplier upcycles

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Let vv be an upcycle constructed by the alphabet multiplier theorem from an upcycle uu and multiplier kk. Let nn and dd be the parameters in that construction. Slicing vv into cyclic partial words of a specified common length, with the slicing allowed to start at any index, produces a collection of partial words.

Uniform-slicing conjecture. For every 0≤i≤n−d0\leq i\leq n-d, if the slicing length is ki∣u∣k^i|u|, then the resulting collection is an upfamily.

This is presented as a stronger conjecture than the existence claim above. The paper reports computational verification for the upcycle 001⋄110⋄001\mathord{\diamond}110\mathord{\diamond} with multipliers k=2,3,4,5k=2,3,4,5, while the general assertion remains unresolved.

References

Primary source

William D. Carey, Matthew David Kearney, Rachel Kirsch and Stefan Popescu, “Universal partial tori”, arXiv:2409.12417 (2025).

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