Positive radial solutions for some quasilinear elliptic systems in exterior domains

We use fixed-point theorem of cone expansion/compression type to prove the existence of positive radial solutions for the following class of quasilinear elliptic systems in exterior domains -Delta(p)u = k(1)(vertical bar x vertical bar)f(u,v), for vertical bar x vertical bar > 1 and x is an element of R-N, -Delta(p)u = k(2)(vertical bar x vertical bar)g(u, v), for vertical bar x vertical bar > 1 and x is an element of R-N, u(x) = v(x) = 0, for vertical bar x vertical bar = 1, u(x), v(x) -> 0 as vertical bar x vertical bar -> +infinity where 1 < p < N and Delta(p)u = div(vertical bar del vertical bar u vertical bar(p-2) del u) is the p-Laplacian operator. We consider nonlinearities that are either superlinear or sublinear.