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Journal of Inequalities and Applications 
Volume 2006 (2006), Article ID 69379, 5 pages
doi:10.1155/JIA/2006/69379

Extensions of Hardy inequality

Junyong Zhang

The Graduate School of China Academy of Engineering Physics, P.O. Box 2101, Beijing 100088, China

Received 2 May 2006; Revised 2 August 2006; Accepted 13 August 2006

Abstract

We study extended Hardy inequalities using Littlewood-Paley theory and nonlinear estimates' method in Besov spaces. Our results improve and extend the well-known results of Cazenave (2003).