Erratum to: “Travelling waves for a system of equations” [Nonlinear Anal. 68(12) (2008) 3909–3912]

We correct an oversight in the proof of Theorem 1.1 in [Shair Ahmad, Alan C. Lazer, Antonio Tineo, Traveling waves for a system of equations, Nonlinear Analysis 68 (12) (2008)], which, in addition to considerably reducing the assumptions made in [M.M. Tang, P.C. Fife, Propagating fronts for competing species equations with diffusion, Arch. Ration. Mech. Anal. 73 (1980). [2]], gives a better derivation and a sharper estimate of the wave speed.