Electronic Journal of Differential Equations, Vol. 2008(2008), No. 75, pp. 1-11. Title: Some basic theorems on difference-differential equations Author: Baburao G. Pachpatte (Aurangabad, Maharashtra, India) Abstract: In this paper some basic theorems on the existence, uniqueness and continuous dependence of solutions of a certain difference-differential equation are established. The well known Banach fixed point theorem and the Gronwall-Bellman integral inequality are used to establish these results. Submitted December 21, 2007. Published May 22, 2008. Math Subject Classifications: 34K05, 34K10, 34K40. Key Words: Difference-differential equations; Banach fixed point theorem; Gronwall-Bellman integral inequality; existence and uniqueness; continuous dependence.