Acta Mathematica Sinica, English Series

, Volume 29, Issue 7, pp 1381–1390

Orthogonality and quintic functional equations


    • Department of Mathematics, Research Institute for Natural SciencesHanyang University
  • Jian Lian Cui
    • Department of Mathematical SciencesTsinghua University
  • Madjid Eshaghi Gordji
    • Department of MathematicsSemnan University

DOI: 10.1007/s10114-013-1061-3

Cite this article as:
Park, C., Cui, J.L. & Gordji, M.E. Acta. Math. Sin.-English Ser. (2013) 29: 1381. doi:10.1007/s10114-013-1061-3


Using the fixed point method, we prove the Hyers-Ulam stability of an orthogonally quintic functional equation in Banach spaces and in non-Archimedean Banach spaces.


Hyers-Ulam stabilityorthogonally quintic functional equationfixed pointorthogonality spacenon-Archimedean Banach space

MR(2010) Subject Classification


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© Institute of Mathematics, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Chinese Mathematical Society and Springer-Verlag Berlin Heidelberg 2013