Abstract

Some oscillation criteria for even order functional differential equations x ( n) ( t) + q( t) f( x( t), x( g 1( t)),…, x( g m ( t))) = 0 and x ( n) ( t) + p( t) x ( n − 1) ( t) + q( t) f( x( g 1( t)),…, x( g m ( t))) = 0 are given. These criteria are an extension of some recent results established by S. R. Grace and B. S. Lalli.

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