Bukh's corrected conjecture on sums of linear transformations

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Let L0,…,Lk∈Mat⁡d(Z)\mathcal{L}_0,\ldots,\mathcal{L}_k\in\operatorname{Mat}_d(\mathbb{Z}) be irreducible and coprime matrices, and let AA be a finite subset of Zd\mathbb{Z}^d. Bukh's corrected conjecture. One should have

∣L0A+⋯+LkA∣≥(∣det⁡(L0)∣1/d+⋯+∣det⁡(Lk)∣1/d)d∣A∣−o(∣A∣).|\mathcal{L}_0 A+\cdots+\mathcal{L}_k A|\geq\left(|\det(\mathcal{L}_0)|^{1/d}+\cdots+|\det(\mathcal{L}_k)|^{1/d}\right)^d|A|-o(|A|).

This is a discrete Brunn–Minkowski-type conjecture for sums of linear transformations. The source describes it as a corrected version of Bukh's original conjecture, first stated in work cited as CL23, but does not provide evidence that it has been resolved.

References

Primary source

David Conlon and Jeck Lim, “Sums of algebraic dilates”, arXiv:2508.18586 (2025).

Additional references

3 papers in this index state this conjecture (2019–2025). The statement above is taken from the most recent of them; the others are arXiv:2203.09827, arXiv:1902.07665.

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