Dyadic one-function form of Zygmund's conjecture

Let Φ:Zd1Z\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××2md1×2Φ(m1,,md1).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 ψd2(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.

Sources & referencesView supporting material

Primary source

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

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