EN
Oscillation theorems are established for forced second order mixed-nonlinear elliptic differential equations
⎧ $div(A(x)||∇y||^{p-1}∇y) + ⟨b(x),||∇y||^{p-1}∇y⟩ + C(x,y) = e(x)$,
⎨
⎩ $C(x,y) = c(x)|y|^{p-1}y + ∑_{i=1}^m c_i(x)|y|^{p_i-1}y}$
under quite general conditions. These results are extensions of the recent results of Sun and Wong, [J. Math. Anal. Appl. 334 (2007)] and Zheng, Wang and Han [Appl. Math. Lett. 22 (2009)] for forced second order ordinary differential equations with mixed nonlinearities, and include some known oscillation results in the literature