Stability of Jensen functional equation in intuitionistic fuzzy normed space

In this paper, we determine some stability results concerning the Jensen functional equation 2f ððx þ yÞ=2Þ ¼ f ðxÞ þ f ðyÞ in intuitionistic fuzzy normed spaces (IFNS). We define the intuitionistic fuzzy continuity of the Jensen mappings and prove that the existence of a solution for any approximately Jensen mapping implies the completeness of IFNS.