Abstract and Applied Analysis
Volume 2011 (2011), Article ID 874949, 6 pages
http://dx.doi.org/10.1155/2011/874949
Research Article

Approximately Multiplicative Functionals on the Spaces of Formal Power Series

F. Ershad and S. H. Petroudi

Department of Mathematics, Payame Noor University, P.O. Box 19395-4697, Tehran 19569, Iran

Received 20 February 2011; Accepted 5 May 2011

Academic Editor: John Rassias

Copyright © 2011 F. Ershad and S. H. Petroudi. 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.

Abstract

We characterize the conditions under which approximately multiplicative functionals are near multiplicative functionals on weighted Hardy spaces.