Type: Article
Publication Date: 2018-01-01
Citations: 56
DOI: https://doi.org/10.4310/arkiv.2018.v56.n1.a9
It is shown for the non-centered Hardy–Littlewood maximal operator $M$ that ${\lVert DMf \rVert}_1 \: \leq C_n \: {\lVert Df \rVert}_1$ for all radial functions in $W^{1,1} (\mathbb{R}^n)$.