Journal of Shanghai University(Natural Science Edition) ›› 2020, Vol. 26 ›› Issue (6): 853-883.doi: 10.12066/j.issn.1007-2861.2259

• Invited Review •     Next Articles

Spatial contrast structure for singular perturbation problems with right end discontinuities

NI Mingkang1,2(), PAN Yafei3, WU Xiao1   

  1. 1. School of Mathematical Sciences, East China Normal University, Shanghai 200062, China
    2. Shanghai Key Laboratory of Pure Mathematics and Mathematical Practice, Shanghai 200062, China
    3. Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 211167, China
  • Received:2020-10-11 Online:2020-12-31 Published:2020-12-29
  • Contact: NI Mingkang E-mail:xiaovikdo@163.com

Abstract:

This paper surveys recent developments in spatial contrast structure solutions to singularly perturbed problems with discontinuous right-hand sides. Studies on second-order non-linear singularly perturbed problems, including semi-linear, quasi-linear, and weakly non-linear system Dirichlet problems, are reviewed. In addition, the first-order ordinary differential equations under homogeneous Neumann conditions are discussed. A type of piecewise-continuous second-order Dirichlet problems of the Tikhonov system and boundary value problem of a singularly perturbed parabolic equation with a discontinuous term is also included.

Key words: singularly perturbed system, right end discontinuities, contrast spatial structure solution, slow-fast system, boundary layer function method, sewing connection method

CLC Number: