Electronic Journal of Differential Equations, Vol. 2009(2009), No. 162, pp. 1-8. Title: Uniqueness of a symmetric positive solution to an ODE system Author: Orlando Lopes (IMEUSP, Sao Paulo, Brazil) Abstract: In this article, we prove uniqueness of symmetric positive solutions of the variational ODE system $$\displaylines{ -w''+a w-wv=0 \cr -v''+b v -\frac{w^2}{2}=0, }$$ where $a$ and $b$ are positive constants. Submitted October 9, 2009. Published December 21, 2009. Math Subject Classifications: 34A34. Key Words: Symmetric positive solutions; variational ODE systems.