OSCILLATION THEOREMS FOR CERTAIN HIGHER ORDER NONLINEAR FUNCTIONAL DIFFERENTIAL EQUATIONS

Some new oscillation theorems forhigher-order nonlinear functional differential equations of the form$$frac{{ m d}^n}{{ m d}t^n}left(a(t)left(frac{{ m d}^nx(t)}{{ m d}t^n} ight)^{!alpha}, ight)+q(t)fig(xig(g(t)ig)ig)=0,quad alpha>0,$$are established.