A simple approach to Hardy inequalities
In the paper the author explains two ways how to get Hardy-type inequalities of higher order in a more-dimensional case. The first one is based on an application of the divergence theorem [and it is related to Th. 14.9 in \textit{B. Opic} and \textit{A. Kufner}: ``Hardy-type inequalities'' (1990; Zbl 0698.26007)] while the second one relies on an application of identities of Rellich-Pokhozhaev type.
scientific article; zbMATH DE number 1531343