Journal of Inequalities and Applications
Volume 2008 (2008), Article ID 890137, 7 pages
Research Article

Some Multiplicative Inequalities for Inner Products and of the Carlson Type

Sorina Barza,1 Lars-Erik Persson,2 and Emil C. Popa3

1Department of Mathematics, Karlstad University, 65188 Karlstad, Sweden
2Department of Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
3Department of Mathematics, “Lucian Blaga” University of Sibiu, 550024 Sibiu, Romania

Received 26 September 2007; Accepted 17 January 2008

Academic Editor: Wing-Sum Cheung

Copyright © 2008 Sorina Barza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We prove a multiplicative inequality for inner products, which enables us to deduce improvements of inequalities of the Carlson type for complex functions and sequences, and also other known inequalities.