TY - JOUR T1 - Necessary and Sufficient Conditions of Doubly Weighted Hardy-Littlewood-Sobolev Inequality AU - Z. Shi, W. Di & D. Y. Yan JO - Analysis in Theory and Applications VL - 2 SP - 193 EP - 204 PY - 2014 DA - 2014/06 SN - 30 DO - http://doi.org/10.4208/ata.2014.v30.n2.5 UR - https://global-sci.org/intro/article_detail/ata/4484.html KW - Hölder's inequality, Young's inequality, Hardy-Littlewood-Sobolev inequality, Lorentz space. AB -
Using product and convolution theorems on Lorentz spaces, we characterize the sufficient and necessary conditions which ensure the validity of the doubly weighted Hardy-Littlewood-Sobolev inequality. It should be pointed out that we consider whole ranges of $p$ and $q$, i.e., $0< p\le \infty$ and $0< q\le \infty$.