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  • 1 Department of Mathematical Sciences, Qufu Normal University Qufu 273165, Shandong, P. R. China Qufu 273165, Shandong, P. R. China
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Summary  

Using the integral average method, we give some new oscillation criteria for the second order differential equation with damped term  (a(t)Ψ(x(t))K(x'(t)))'+p(t)K(x'(t))+q(t)f(x(t))=0, t≧t0. These results improve and generalize the oscillation criteria in[1], because they eliminate both the differentiability of p(t) and the sign of p(t), q(t). As a consequence, improvements of Sobol's type oscillation criteria are obtained.

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