# Exponential Ordering for Nonautonomous Neutral Functional Differential Equations

## Abstract

*D*-operator, when the exponential ordering is considered. Under adequate hypotheses of stability for the order on bounded sets, we show that the omega-limit sets are copies of the base to explain the long-term behavior of the trajectories. The application to the study of the amount of material within the compartments of a neutral compartmental system with infinite delay shows the improvement with respect to the standard ordering.

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**Submitted**: 22 December 2008

**Accepted**: 16 April 2009

**Published online**: 10 July 2009

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