Document Type : Original Article
1 Department of Mathematics R.M.K. Engineering College Kavarapettai
2 Department of Mathematics, Hanyang University, Republic of Korea
3 Pedagogical Department E.E., Section of Mathematics and Informatics, National and Capodistrian University of Athens, 4, Agamemnonos Str. Aghia Paraskevi, Athens 15342, Greece.
In this paper, we prove the Ulam-Hyers stability of the following quartic functional equation in paranormed spaces using both direct and fixed point methods.