Abstract
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 $W^{1,1} (\mathbb{R}^n)$.
Funding Statement
The author was supported by the Academy of Finland, project no. 292797.
Citation
Hannes Luiro. "The variation of the maximal function of a radial function." Ark. Mat. 56 (1) 147 - 161, April 2018. https://doi.org/10.4310/ARKIV.2018.v56.n1.a9
Information