APPROXIMATE ADDITIVE-QUADRATIC MAPPINGS AND BI-JENSEN MAPPINGS IN 2-BANACH SPACES

Abstract

In this paper, we obtain the stability of the additivequadratic functional equation f (x+y; z+w)+f (x+y; z(cid:0)w) = 2f (x; z)+2f (x; w)+2f (y; z)+2f (y; w)

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