Electronic Journal of Differential Equations, Vol. 2009(2009), No. 67, pp. 1-7. Title: Comparison results for semilinear elliptic equations via Picone-type identities Author: Tadie (Universitetsparken 5, Copenhagen, Denmark) Abstract: By means of a Picone's type identity, we prove uniqueness and oscillation of solutions to an elliptic semilinear equation with Dirichlet boundary conditions. Submitted November 14, 2008. Published May 14, 2009. Math Subject Classifications: 35J60, 35J70. Key Words: Picone's identity; semilinear elliptic equations.