On the oscillation of second order quasilinear elliptic equations

By using the Riccati technique, some oscillation criteria for the second order quasilinear elliptic equation ∑i,j=1NDi[Φ(y)Aij(x)|Dy|p−2Djy]+p(x)f(y)=0 are established. These results contain the known oscillation theorems from the literature as special cases.