Copyright © 2009 Zhenlai Han et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
By means of Riccati transformation technique, we
establish some new oscillation criteria for the second-order
nonlinear delay dynamic equations
on a time scale ; here is a quotient of odd
positive integers with and real-valued positive
rd-continuous functions defined on . Our results not only extend some results established by Hassan in 2008 but also unify the
oscillation of the second-order nonlinear delay differential
equation and the second-order nonlinear delay difference equation.