Oscillations of linear integro-differential equations

Sufficient conditions which guarantee that certain linear integro-differential equation cannot have a positive solution are established.     

Nonoscillatory bounded solutions of neutral differential systems

The article contains some sufficient conditions for the existence of a nonoscillatory bounded solution of the nonlinear neutral differential systems. The main results are presented in several theorems.     

Existence for positive solutions of second-order neutral nonlinear differential equations

We consider the nonlinear neutral differential equations. This work contains some sufficient conditions for the existence of a positive solution which is bounded with exponential functions. The case when the solution converges to zero is also treated.