الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The aim of this thesis is to study the sufficient conditions for the oscillation of solutions of functional differential equations where in recent year there has been much research activity concerning the oscillation of neutral delay differential equations. New applications , which involve neutral delay differential equations, appears in networks containing lossless transmission lines, in vibrating masses attached to elastic bar and also as the Euler equation in some volitional problems, continue to arise with increasing frequency in the modeling of diverse phenomena in physics, biology, ecology and physiology. In this thesis , we discussed oscillatory of the solutions of neutral delay differential equations in the form (1) (2) (3) (4) , qi ( t ) f(y ( t – i)) = e ( t ) , t tk (5) ( y ( t ) – p y ( t – )) + y ( ) – y ( tk ) = bk y ( tk ) , k z+. (6) ( y ( t ) – p y ( t – )) + qi ( t ) y ( t – i) = e ( t ) , t tk y ( ) – y ( tk ) = bk y ( tk ) , k z+.