arXiv:2109.14179v3

A Periodicity Result for Tilings of Z3\mathbb Z^3 by Clusters of Prime-Squared Cardinality

Abhishek Khetan

math.COmath.DS37A1537B1052C20

Abstract

We show that if Z3\mathbb Z^3 can be tiled by translated copies of a set FZ3F\subseteq\mathbb Z^3 of cardinality the square of a prime then there is a weakly periodic FF-tiling of Z3\mathbb Z^3, that is, there is a tiling TT of Z3\mathbb Z^3 by translates of FF such that TT can be partitioned into finitely many 11-periodic sets.

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Audited against arXiv v3

Not a correctness certificate. A “Correct” result may include yellow typos or minor formal corrections that do not affect substantive soundness. It means this audit found no unresolved substantive error under the stated criteria; it does not replace expert scrutiny or formal verification.

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Detailed mathematical audit

Generated August 18, 2026
01Statements2 reported findingsCorrect

The main theorem that every exact cluster of prime-squared cardinality in Z3\mathbb Z^3 admits a one-weakly-periodic tiling is correct.

Theorem 4.1Correct

Prime-squared clusters admit the asserted weakly periodic tilings

Pages 13–18 and Appendix C · Theorem 4.1 · arXiv:2109.14179v3

The spectral-measure identity forces the Fourier support into the stated union of torsion cosets. The algebraic case split is exhaustive for cardinality p2p^2: the prism alternatives reduce to established one- and two-dimensional periodic tilings, while the remaining finite-line support case satisfies the hypotheses of the weak-periodic decomposition proved in Appendix C. Each resulting component is invariant under a nonzero period, which is exactly the paper's one-weak-periodicity conclusion.

Structural reductionsCorrect

The lower-dimensional and prism cases preserve exact tiling multiplicity

Sections 2–4 · dilation identities and prism lemmas · arXiv:2109.14179v3

The reductions use exact convolution identities, so no density or almost-everywhere tiling is substituted for an exact tiling. Products with the one-dimensional periodic tiling and the two-dimensional prime-cardinality tiling preserve multiplicity one and give genuine periods in Z3\mathbb Z^3.

02Proofs2 reported findingsCorrect

The Fourier-spectral proof, algebraic case analysis, and Appendix C decomposition are complete and cover all configurations allowed by the hypotheses.

Proof of Theorem 4.1Correct and complete

The support classification closes all cases

Pages 13–18 and Appendix C · arXiv:2109.14179v3

The dilation equations are applied only at prime orders licensed by the cluster cardinality. When a rank-two periodic factor occurs, the cited planar theorem applies; otherwise the spectral support meets the finite family of rational lines required by Appendix C. The final sum of periodic components reconstructs the original tiling function exactly.

Lemmas C.5–C.18Correct and complete

Finite-line spectral support yields a weakly periodic decomposition

Pages 17–27 · Appendix C · arXiv:2109.14179v3

The spectral projections onto the finitely many rational-line components commute with the lattice action and give periodic pieces of the tiling indicator in L2L^2. After passage to a finite-index subgroup, the ergodic-component argument separates the two-periodic portions; Lemmas C.16 and C.17 show that complements preserve the needed weak-periodicity class. Corollary C.18 then reconstructs the original indicator as a finite disjoint union of one-periodic pieces, which is precisely the asserted one-weak periodicity.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2109.14179v3
Authors listed
Abhishek Khetan
Audit date
August 18, 2026
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