Abstract
In this paper, we determine some stability results concern- ing the 2-dimensional vector variable quadratic functional equation f(x+ y;z + w) + f(x y;z w) = 2f(x;z) + 2f(y;w) in intuitionistic fuzzy normed spaces (IFNS). We dene the intuitionistic fuzzy continuity of the 2-dimensional vector variable quadratic mappings and prove that the ex- istence of a solution for any approximately 2-dimensional vector variable quadratic mapping implies the completeness of IFNS.
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