Acta Mathematica Sinica, English Series

, Volume 29, Issue 7, pp 1381–1390

Orthogonality and quintic functional equations

  • Choonkil Park
  • Jian Lian Cui
  • Madjid Eshaghi Gordji


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 stability orthogonally quintic functional equation fixed point orthogonality space non-Archimedean Banach space 

MR(2010) Subject Classification

39B55 46S10 47H10 39B52 47S10 30G06 46H25 12J25 


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Copyright information

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

Authors and Affiliations

  • Choonkil Park
    • 1
  • Jian Lian Cui
    • 2
  • Madjid Eshaghi Gordji
    • 3
  1. 1.Department of Mathematics, Research Institute for Natural SciencesHanyang UniversitySeoulSouth Korea
  2. 2.Department of Mathematical SciencesTsinghua UniversityBeijingP. R. China
  3. 3.Department of MathematicsSemnan UniversitySemnanIran

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