Geodesic
Hyers-ulam Stability of a General Quadratic Functional Equation
Publications de l'Institut Mathématique, _N_S_73 (2003) no. 87, p. 129 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

We obtain a general solution and solve the Hyers--Ulam stability problem for the general quadratic functional equation $ f(x+y+z)+f(x-y)+f(x-z)=f(x-y-z)+f(x+y)+f(x+z). $
Classification : 39B22 39B52 39B72
Keywords: Hyers-Ulam stability, quadratic functional equation 
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     author = {Hark-Mahn Kim},
     title = {Hyers-ulam {Stability} of a {General} {Quadratic} {Functional} {Equation}},
     journal = {Publications de l'Institut Math\'ematique},
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     publisher = {mathdoc},
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     number = {87},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2003_N_S_73_87_a10/}
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Hark-Mahn Kim. Hyers-ulam Stability of a General Quadratic Functional Equation. Publications de l'Institut Mathématique, _N_S_73 (2003) no. 87, p. 129 . http://geodesic.mathdoc.fr/item/PIM_2003_N_S_73_87_a10/