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  Volume 8, Issue 3, Article 89
 
Hyers-Ulam-Rassias Stability of the $K$-Quadratic Functional Equation

    Authors: Mohamed Ait Sibaha, Belaid Bouikhalene, Elhoucien Elqorachi,  
    Keywords: Group, Additive equation, Quadratic equation, Hyers-Ulam-Rassias stability.  
    Date Received: 26/01/07  
    Date Accepted: 08/06/07  
    Subject Codes:

39B82, 39B52, 39B32.

 
    Editors: Kazimierz Nikodem,  
 
    Abstract:

In this paper we obtain the Hyers-Ulam-Rassias stability for the functional equation

$displaystyle frac{1}{vert Kvert}sum_{kin K}f(x+kcdot y)=f(x)+f(y),;;x,yin G, $
where $ K$ is a finite cyclic transformation group of the abelian group $ (G,+) $, acting by automorphisms of $ G$. As a consequence we can derive the Hyers-Ulam-Rassias stability of the quadratic and the additive functional equations.

         
       
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