Oscillations of solutions of neutral differential equations with positive and negative coefficients Original Research Article

We obtain some new results for oscillation of all solutions of the neutral differential equation with positive and negative coefficients where P, Q, R ϵ C([t0, ∞), R), r ϵ (0, ∞, and τ, σ ϵ (0, ∞). These new results are obtained by establishing and using some new lemmas which are interesting in their own right and which may have further applications in analysis.