Electronic Journal of Differential Equations, Vol. 2007(2007), No. 131, pp. 1-13. Title: A nonlinear transmission problem with time dependent coefficients Authors: Eugenio Cabanillas Lapa (Univ. Nacional, Lima, Peru) Jaime E. Munoz Rivera (Lab. Nacional de Computacao, Brazil) Abstract: In this article, we consider a nonlinear transmission problem for the wave equation with time dependent coefficients and linear internal damping. We prove the existence of a global solution and its exponential decay. The result is achieved by using the multiplier technique and suitable unique continuation theorem for the wave equation. Submitted May 2, 2007. Published October 09, 2007. Math Subject Classifications: 35B40, 35L70, 45K05. Key Words: Transmission problem; time dependent coefficients; stability.