Fixed Point Theory and Applications
Volume 2008 (2008), Article ID 945010, 7 pages
A Fixed Point Approach to the Stability
of a Functional Equation of the Spiral of Theodorus
1Mathematics Section, College of Science and Technology, Hong-Ik University, 339-701 Chochiwon, South Korea
2Mathematics Section, Pedagogical Department, National and Capodistrian University of Athens, 4 Agamemnonos Street, Aghia Paraskevi, Attikis, 15342 Athens, Greece
Received 2 April 2008; Accepted 26 June 2008
Academic Editor: Fabio Zanolin
Copyright © 2008 Soon-Mo Jung and John Michael Rassias. 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.
Cădariu and Radu applied the fixed point method to the investigation of Cauchy
and Jensen functional equations. In this paper, we adopt the idea of Cădariu and Radu
to prove the stability of a functional equation of the spiral of Theodorus, .