2020/04/30 by Theresa C. Anderson, Bingyang Hu, Anderson, Theresa C. +1
Mathematics · #Advanced Harmonic Analysis Research #Algebraic Geometry and Number Theory #Classical Analysis and ODEs (math.CA) #FOS: Mathematics #advanced mathematical theories
paper · pdf · doi:10.48550/arxiv.2004.14929
openalex publication_date 2020/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Adjacent dyadic systems are pivotal in analysis and related fields to study continuous objects via collections of dyadic ones. In our prior work (joint with Jiang, Olson and Wei) we describe precise necessary and sufficient conditions for two dyadic systems on the real line to be adjacent. Here we extend this work to all dimensions, which turns out to have many surprising difficulties due to the fact that d+1, not 2d, grids is the optimal number in an adjacent dyadic system in ℝd. As a byproduct, we show that a collection of d+1 dyadic systems in ℝd is adjacent if and only if the projection of any two of them onto any coordinate axis are adjacent on ℝ. The underlying geometric structures that arise in this higher dimensional generalization are interesting objects themselves, ripe for future study; these lead us to a compact, geometric description of our main result. We describe these structures, along with what adjacent dyadic (and n-adic, for any n) systems look like, from a variety of contexts, relating them to previous work, as well as illustrating a specific example.