Published in Issue 2025-05-26
How to Cite
RN-nearly mixed type A-Q functional equation. (2025). Mathematical Analysis and Its Contemporary Applications, 7(2). https://doi.org/10.30495/maca.2025.2060396.1136
PDF views: 0
Abstract
In this paper, using direct and fixed point methods, we prove the generalized Hyers-Ulam stability of the following mixed additive-quadratic functional equation: 2f((x+y)/2)+2f((x−y)/2)=1/2{(3f(x)−f(−x))+(f(y)+f(−y))} in random normed spaces.
Keywords
- Generalized Hyers-Ulam stability,
- Random normed space,
- Fixed point method
References
- H. Azadi Kenary, Hyres-Rassias stability of the Pexiderial functional equation, to appear in Ital. J. Pure Appl. Math.
- H. Azadi Kenary, Stability of a Pexiderial functional equation in random normed spaces, Rend. Circ. Mat. Palermo, 60 (2011), 59–68.
- P. W. Cholewa, Remarks on the stability of functional equations, Aequat. Math., 27 (1984), 76-86.
- S. Czerwik, Functional Equations and Inequalities in several variables, World Scientific, River Edge, NJ, 2002.
- M. Eshaghi Gordji and M. Bavand Savadkouhi, Stability of mixed type cubic and quartic functional equations in random normed spaces, J. Ineq. Appl., 2009 (2009), Article ID 527462, 9 pages.
- M. Eshaghi Gordji, M. Bavand Savadkouhi, and Choonkil Park, Quadratic-quartic functional equations in RN-spaces, J. Ineq. Appl., 2009 (2009), Article ID 868423, 14 pages.
- M. Eshaghi Gordji and H. Khodaei, Stability of Functional Equations, Lap Lambert Academic Publishing, 2010.
- M. Eshaghi Gordji, S. Zolfaghari, J.M. Rassias, and M.B. Savadkouhi, Solution and stability of a mixed type cubic and quartic functional equation in quasi-Banach spaces, Abst. Appl. Anal., 2009 (2009), Article ID 417473, 14 pages.
- P. Găvruţa, A generalization of the Hyers-Ulam-Rassias stability of approximately additive mappings, J. Math. Anal. Appl., 184 (1994), 431–436.
- D. H. Hyers, On the stability of the linear functional equation, Proc. Natl. Acad. Sci. USA 27 (1941), 222–224.
- D. H. Hyers, G. Isac, and Th. M. Rassias, Stability of functional equations in several variables, Birkhäuser, Basel, 1998.
- H. Khodaei and Th.M. Rassias, Approximately generalized additive functions in several variabels, Int. J. Nonlinear Anal. Appl., 1 (2010), 22–41.
- C. Park, Generalized Hyers-Ulam-Rassias stability of n-sesquilinear-quadratic mappings on Banach modules over C* -algebras, J. Comput. Appl. Math., 180 (2005), 279–291.
- C. Park, A. Bodaghi, and I.A. Alias, Random stability and hyperstability of multi-quadratic mappings, J. Math. Inequal., 16(3) (2022), 993–1004.
- C. Park, Fuzzy stability of a functional equation associated with inner product spaces, Fuzzy Sets Syst., 160 (2009), 1632–1642.
- C. Park, Generalized Hyers-Ulam-Rassias stability of n-sesquilinear-quadratic mappings on Banach modules over C* -algebras, J. Comput. Appl. Math., 180 (2005), 279–291.
- J. M. Rassias, E. Sathya, and M. Arunkumar, Generalized Ulam-Hyers stability of an alternate additive-quadratic-quartic functional equation in fuzzy Banach spaces, Math. Anal. Contemp. Appl., 3(1) (2021), 13–31
- D. Mihet and V. Radu, On the stability of the additive Cauchy functional equation in random normed spaces, J. Math. Anal. Appl., 343 (2008), 567–572.
- Th. M. Rassias, On the stability of the linear mapping in Banach spaces, Proc. Amer. Math. Soc., 72 (1978), 297–300.
- Th. M. Rassias, Functional Equations, Inequalities and Applications, Kluwer Academic Publishers Co., Dordrecht, Boston, London, 2003.
- Th. M. Rassias, Problem 16;2, Report of the 27th International Symp. on Functional Equations, Aequations Math., 39 (1990), 292–293.
- Th. M. Rassias, On the stability of the quadratic functional equation and its applications, Studia Univ. Babes-Bolyai, 43 (1998), 89–124.
- Th. M. Rassias, The problem of S.M. Ulam for approximately multiplicative mappings, J. Math. Anal. Appl. 246 (2000), 352–378.
- Th. M. Rassias, On the stability of functional equations in Banach spaces, J. Math. Anal. Appl., 251 (2000), 264–284.
- Th. M. Rassias and P. Semrl, On the behaviour of mappings which do not satisfy Hyers-Ulam stability, Proc. Amer. Math. Soc. 114 (1992), 989—993.
- Th. M. Rassias and P. Şemrl, On the Hyers-Ulam stability of linear mappings, J. Math. Anal. Appl. 173 (1993), 325–338.
- K. Ravi, M. Arunkumar, and J.M. Rassias, Ulam stability for the orthogonally general Euler-Lagrange type functional equation, Int. J. Math. Sci., 3(8) (2008), 36–47.
- R. Saadati, M. Vaezpour, and Y. J. Cho, A note to paper “On the stability of cubic mappings and quartic mappings in random normed spaces”, J. Ineq. Appl., 2009 (2009), Article ID 214530.
- R. Saadati, M. M. Zohdi, and S. M. Vaezpour, Nonlinear L-random stability of an ACQ functional equation, J. Inequal. Appl. 2011 (2011), Article ID 194394, 23 pages.
- B. Schewizer and A. Sklar, Probabilistic Metric Spaces, North-Holland Series in Probability and Applied Mathematics, North-Holland, New York, USA, 1983.
- F. Skof, Local properties and approximation of operators, Rend. Sem. Mat. Fis. Milano, 53 (1983), 113–129.
- S. M. Ulam, Problems in Modern Mathematics, Science Editions, John Wiley and Sons, 1964.
10.30495/maca.2025.2060396.1136