The endpoint Fefferman-Stein inequality for the strong maximal function

Abstract

Let Mnf denote the strong maximal function of f on Rn, that is the maximal average of f with respect to n-dimensional rectangles with sides parallel to the coordinate axes. For any dimension n > 2 we prove the natural endpoint Fefferman-Stein inequality for Mn and any strong Muckenhoupt weight w: w({x ∈ Rn : Mnf(x) > λ}) .w,n Z Rn |f(x)| λ 1 + log+ |f(x)| λ n−1 Mnw(x)dx. This extends the corresponding two-dimensional result of T. Mitsis.