Fixed Point Theory and Applications
Volume 2009 (2009), Article ID 170140, 7 pages
doi:10.1155/2009/170140
Research Article

Generalized Caristi's Fixed Point Theorems

Abdul Latif

Department of Mathematics, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia

Received 27 December 2008; Accepted 9 February 2009

Academic Editor: Mohamed A. Khamsi

Copyright © 2009 Abdul Latif. 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 present generalized versions of Caristi's fixed point theorem for multivalued maps. Our results either improve or generalize the corresponding generalized Caristi's fixed point theorems due to Bae (2003), Suzuki (2005), Khamsi (2008), and others.