The hyper aperiodic extension conjecture for partial colorings

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Let GG be a countable group, let A⊆GA \subseteq G, let k>1k > 1 be an integer, and let y:A→ky: A \rightarrow k. Define y∗∈(k+1)Gy_* \in (k+1)^G by setting y∗(a)=y(a)y_*(a) = y(a) for a∈Aa \in A and y∗(g)=ky_*(g) = k for g∈G−Ag \in G - A.

Hyper aperiodic extension conjecture. Then yy can be extended to a hyper aperiodic point in kGk^G if and only if [y∗]‾∩kG\overline{[y_*]} \cap k^G consists of aperiodic points.

This conjecture proposes a complete criterion for extending a partial coloring to a hyper aperiodic coloring, generalizing the preceding extension theorem for cofinite complements. Its status is not resolved in the supplied text.

References

Primary source

Su Gao, Steve Jackson and Brandon Seward, “Group Colorings and Bernoulli Subflows”, arXiv:1201.0513 (2012).

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