Sufficient and Necessary Conditions for Oscillation of Neutral Equations
Li Guanghua (Departement of Mathematics)
We consider the neutral delay differential equation where pi g∈c[t0,∞),R+] and τi, σ∈R+ (i=l,2, … , n). We obtain sufficient and nece-sary conditions for all solutions of Eq( 1 ) to oscill ate. We also obtain sufficient con -sdions for all solutions of Eq( 1 ) to oscilllate.