Existence of positive solutions of singular p-Laplacian equations in a ball

In this paper, we investigate singular p-Laplacian equations of the form Δpu+f(x,∇u)u−λ=0 with zero Dirichlet boundary condition in a ball B⊂RN; where p 1 ,λ 0, and give a sufficient condition for the equation to have a positive solution, by means of a supersolution and a subsolution.