Oscillation of Second-order Nonlinear Delay Dynamic Equations on Time Scales

By using the generalized Riccati transformation and the inequality technique,we establish a new oscillation criterion for the second-order nonlinear delay dynamic equations on time scales.The results not only extend and improve some known theorems,but also unify the oscillation of the second-order nonlinear delay differential equation and the second-order nonlinear delay difference equation.