Dyadic one-function form of Zygmund's conjecture

Let Φ:Zd−1→Z\Phi:\mathbb{Z}^{d-1}\to\mathbb{Z} be monotone increasing in each argument, and let Zd\mathcal{Z}_d be the collection of dyadic rectangles in Rd\mathbb{R}^d whose sidelengths are

2m1×⋯×2md−1×2Φ(m1,…,md−1).2^{m_1}\times\dots\times2^{m_{d-1}}\times2^{\Phi(m_1,\dots,m_{d-1})}.

Write ψj(x):=xlog⁡(e+x)j\psi_j(x):=x\log(e+x)^j. Dyadic Zygmund conjecture. The maximal function MZd\mathcal{M}_{\mathcal{Z}_d} is weak-type ψd−2(L)\psi_{d-2}(L).

This is the dyadic version of the remaining single-function case after the general parameter conjecture was disproved. The source says that the corresponding continuous formulation is open and focuses on this dyadic conjecture, without claiming authorship.

References

Primary source

Guillermo Rey, “An antichain approach to a conjecture of Zygmund”, arXiv:2607.25957 (2026).

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