OSCILLATION FOR SOLUTIONS OF CERTAIN DELAY HYPERBOLIC DIFFERENTIAL EQUATIONS
Weihong Sheng · Journal of Qufu Normal University · 2004
By using a generalized Riccati transformation, some sufficient conditions are established for the oscillation of solutions of delay hyperbolic differential equations of the form ~2 t~2u(x,t) =a(t)Δu(x,t)+sk=1a_k(t)Δ u(x,t-ρ_k)-mj=1q_j(x,t)u(x,t-σ_j), where (x,t)∈Ω×[0,∞)≡G, Ω is a bounded domain in R~N with a piecewise smooth boundary Ω and Δ is the Laplacian in Euclidean N-space R~N.