Interval oscillation criteria for second order neutral nonlinear differential equations

Some oscillation criteria for the second order neutral nonlinear differential equation[y(t)+p(t)y(@s(t))]^''[email protected]?"i"="1^nq"i(t)f"i(y(@t"i(t)))=0,t>=t"0are established. New oscillation criteria are different from most known ones in the sense that they are based on the information only on a sequence of subintervals of [t"0,~), rather than on the whole half-line. Our results are more natural according to the Sturm Separation Theorem.