The periodic tiling conjecture for finite subsets of finitely generated Abelian groups

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Let GG be a finitely generated Abelian group and let FF be a finite subset of GG. A tiling of GG by FF is a set X⊂GX\subset G such that

F⊕X=G.F\oplus X=G.

A tiling is periodic if its translation set is invariant under translations by a finite-index subgroup of GG.

Periodic tiling conjecture. The tiling equation F⊕X=GF\oplus X=G is not aperiodic; equivalently, whenever FF tiles GG by translations, it admits at least one periodic tiling.

This conjecture concerns whether every translational tiling by a finite tile has a periodic realization. Its status is not specified in the source.

References

Primary source

Rachel Greenfeld, “Translational tilings: structured or wild?”, arXiv:2509.25576 (2025).

Additional references

2 papers in this index state this conjecture (2022–2025). The statement above is taken from the most recent of them; the others are arXiv:2211.15847.

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