Boundary Value Problems
Volume 2009 (2009), Article ID 634324, 17 pages
Research Article

On Step-Like Contrast Structure of Singularly Perturbed Systems

Department of Mathematics, East China Normal University, Shanghai 200241, China

Received 15 April 2009; Revised 5 July 2009; Accepted 14 July 2009

Academic Editor: Donal O'Regan

Copyright © 2009 Mingkang Ni and Zhiming Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The existence of a step-like contrast structure for a class of high-dimensional singularly perturbed system is shown by a smooth connection method based on the existence of a first integral for an associated system. In the framework of this paper, we not only give the conditions under which there exists an internal transition layer but also determine where an internal transition time is. Meanwhile, the uniformly valid asymptotic expansion of a solution with a step-like contrast structure is presented.