A note on oscillation criteria for forced second-order nonlinear differential equations with damping

摘要

In this paper, we study the following forced second-order nonlinear differential equation with damping (r(t)k_1(x(t), x(t)))+p(t)k_2(x(t), x(t))k_1(x(t), x(t))+q(t)f(x(t))=e(t) and establish several sufficient conditions for this equation to be oscillatory. In the meanwhile, we point out the mistake in the related articles.