A comparison principle for quasilinear elliptic equations and its application
Zhiren Jin, Kirk Eugene Lancaster · Pacific Journal of Mathematics · 1998
A comparison principle for a class of quasilinear elliptic equations is proved.An application of the comparison principle is given to prove the uniqueness of solutions of Dirichlet problems for a class of elliptic equations with jump discontinuous boundary data.The comparison principle is improved from the one given by Serrin.The uniqueness is proved by reducing the equation to an associated elliptic equation by viewing the graph of the solution from the side.