Oscillation of solutions for certain impulsive vector parabolic differential equations with delays

In this paper, sufficient conditions are established for H-oscillation of solutions of the following impulsive vector parabolic differential equations with delays{∂∂tU(x,t)=a(t)ΔU(x,t)+∑k=1mbk(t)ΔU(x,t−τk)−∑h=1lqh(x,t)U(x,t−σh)+F(x,t),t≠tj,U(x,tj+)−U(x,tj−)=p(x,tj)U(x,tj),j∈I∞,(x,t)∈Ω×R+≡G, where R+=[0,∞)R+=[0,∞), Ω   is a bounded domain in RnRn with a piecewise smooth boundary ∂Ω, and H   is a unit vector in RMRM.