Persson, L. -E.Stefan Samko2018-12-072018-12-072015-061846-579Xhttp://hdl.handle.net/10400.1/11543The sharp constants in Hardy type inequalities are known only in a few cases. In this paper we discuss some situations when such sharp constants are known, but also some new sharp constants are derived both in one-dimensional and multi-dimensional cases.engjournal article10.7153/jmi-09-37