Dyadic one-function form of Zygmund's conjecture
Let be monotone increasing in each argument, and let be the collection of dyadic rectangles in whose sidelengths are
Write . Dyadic Zygmund conjecture. The maximal function is weak-type .
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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