Stability of Deeba and Drygas functional equations in non-Archimedean spaces

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.