Fixed Point Theory and Applications
Volume 2011 (2011), Article ID 484717, 3 pages
Letter to the Editor

A Counterexample to “An Extension of Gregus Fixed Point Theorem”

Department of Mathematics, Faculty of Science, Arak University, Arak 38156-8-8349, Iran

Received 29 November 2010; Accepted 21 February 2011

Copyright © 2011 Sirous Moradi. 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.


In the paper by Olaleru and Akewe (2007), the authors tried to generalize Gregus fixed point theorem. In this paper we give a counterexample on their main statement.