OICC Press Mathematical Analysis and its Contemporary Applications 3 2 2021 04 01 Intuitionistic fuzzy stability of the heptic functional equation 10.30495/maca.2021.1926769.1006 EN Mohammad Shafii Mousavi Department of Mathematics, South Tehran Branch, Islamic Azad University, Tehran, Iran Journal Article 2021 04 01 In this article, by using a fixed point method, we establish the intuitionistic fuzzy version of Hyers-Ulam stability for a heptic functional equation that was introduced by Xu and Rassias. This way shows that the concept of stability is related to some fixed point of a suitable operator.