Davood Khatibi Aghda - Department of Mathematical Sciences, Yazd University, Yazd, Iran
Seyed Mohammad Sadegh Modarres Mosaddegh - Department of Mathematical Sciences, Yazd University, Yazd, Iran

In this paper, we  use new techniques to prove Hyers-Ulam  and Hyers-Ulam-Rasiass stability of Deeba, Drygas and logarithmic functional equations in non-Archimedean normed spaces. We generalize some earlier results connected with the stability of these functional equations and inequalities. In addition, we provide some examples to clarify the definitions and theorems.

Functional equations, Hyers-Ulam stability, Hyers-Ulam-Rassias stability, non-Archimedean normed spaces