Demonstrates oscillation results for nonlinear functional differential equations, highlighting crucial comparisons with linear equations.
In this paper we obtain three oscillation results for forced second order nonlinear functional differential equations.One of these results is obtained by comparing the functional equation to a second order unforced ordinary linear equation while the other two are obtained by comparing the functional equation to a second order un- forced nonlinear ordinary equation.What makes our theorems different from other comparison type results is that the explicit knowledge of the distance between con- secutive zeros of the forcing term is utilized.The types of forcing terms allowed do not have to be small, or periodic, or strongly bounded as was needed in [3-6].Neither do we impose any sign conditions on the functions b and F below, nor do
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Graef et al. (1984) studied this question.
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