Oscillation theorems for nonlinear differential equations of second order (Q1206959)

Oscillation criteria are obtained for nonlinear differential equations of the type (1) \([rg(x)x']'+px'=qf(x)\), where \(p\), \(q\), \(r\) are real-valued continuous functions in a non-negative interval \([t_ 0,\infty)\), \(f\), \(g\) are real-valued continuous functions in \((-\infty,\infty)\), \(r(t)>0\) in \([t_ 0,\infty)\), \(xf(x)>0\), and \(g(x)>0\) for all \(x\neq 0\). The theorems generalize several earlier ones of similar type.