Stability of a Generalized Mixed Type Additive, Quadratic, Cubic and Quartic Functional Equation  
  Authors: K. Ravi, John Michael Rassias, M. Arunkumar, R. Kodandan,  
  Keywords: Additive function, Quadratic function, Cubic function, Quartic function, Generalized Hyers-Ulam-Rassias stability, Ulam-Gavruta-Rassias stability, J.M. Rassias stability.  
  Date Received: 06/07/2009  
  Date Accepted: 06/11/2009  
  Subject Codes:

39B52, 39B82

  Editors: Sever S. Dragomir,  

In this paper, we obtain the general solution and the generalized Hyers-Ulam-Rassias stability of the generalized mixed type of functional equation

egin{multline*} fleft( {x + ay} ight) + fleft( {x - ay} ight) = a^2 lef... ...right) - 4fleft( y ight) - 4fleft( { - y} ight)} ight]. end{multline*}

for fixed integers $ a$ with $ a<br />eq 0, pm 1$. ;

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