Nonlinear Analysis ( IF 1.3 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.na.2020.111889 Cristian González-Riquelme
We study the Sobolev regularity on the sphere of the uncentered fractional Hardy–Littlewood maximal operator at the endpoint , when acting on polar data. We first prove that if , and is a polar function, we have We then prove that the map is continuous from to when restricted to polar data. Our methods allow us to give a new proof of the continuity of the map from to . Moreover, we prove that a conjectural local boundedness for the centered fractional Hardy–Littlewood maximal operator implies the continuity of the map from to , in the context of polar functions on and radial functions on .
中文翻译:
极小数极大函数的Sobolev正则性
我们研究球面上的Sobolev正则性 无心分数Hardy–Littlewood最大算子 在端点 ,当作用于极性数据时。我们首先证明, 和 是极地 功能,我们有 然后,我们证明地图 从连续 至 仅限于极性数据时。我们的方法使我们能够为地图的连续性提供新的证明 从 至 。此外,我们证明了中心分数分数Hardy–Littlewood最大算子的一个猜想局部有界性 暗示地图的连续性 从 至 ,在极函数上 和径向功能 。