3 papers
math.CA2026
Two-parameter variational estimates for averages over tori
Juyoung Lee, Sanghyuk Lee, Feng Zhang +1
One-parameter variational inequalities are well developed, whereas their multi-parameter counterparts remain much less understood. We explore two-parameter variational inequalities…
math.CA2025
Endpoint estimates for the fractal circular maximal function and related local smoothing
Sanghyuk Lee, Luz Roncal, Feng Zhang +1
Sharp -- estimates for the spherical maximal function over dilation sets of fractal dimensions, including the endpoint estimates, were recently proved by Anderson--Hughes…
math.CA2024
-improving bounds for spherical maximal operators over restricted dilation sets: radial improvement
Shuijiang Zhao
In this paper, we study the spherical maximal operator over , restricted to radial functions. In higher dimensions , we establish a complete rang…