Publications de l'Institut Mathématique (Beograd) Vol. 73(87), pp. 129137 (2003) 

HYERSULAM STABILITY OF A GENERAL QUADRATIC FUNCTIONAL EQUATIONHarkMahn KimDepartment of Mathematics, Chungnam National University, Daejeon 305764, KoreaAbstract: We obtain a general solution and solve the HyersUlam stability problem for the general quadratic functional equation $$ f(x+y+z)+f(xy)+f(xz)=f(xyz)+f(x+y)+f(x+z). $$ Keywords: HyersUlam stability; quadratic functional equation Classification (MSC2000): 39B22; 39B52; 39B72 Full text of the article:
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