Oscillation theorems for second order advanced neutral differential equations

\begin{equation*} (r(t)[x(t)+p(t)x(τ(t))]^\prime)^\prime+q(t)x(σ(t))=0. \tag{E} \end{equation*}

Obtained results are based on the new comparison theorems that enable us to reduce problem of the oscillation of the second order equation to the the oscillation of the first order equations. Obtained comparison principles essentially simplify the examination of the studied equations