Note on the Stability of System of Differential Equations mathop x = f(t,x(t))

In this paper, we examine the relation between practical stability and Hyers- Ulam-stability and Hyers-Ulam-Rassias stability as well. In addition,by practical stability we gave a sufficient condition in order that the rst order nonlinear systems of di erential equations has local generalized Hyers-Ulam stability and local generalized Hyers-Ulam-Rassias stability.