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Journal of Shanghai University（Natural Science Edition）

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Boundary value problem for singular perturbed elliptic differential systems with a segment of turning points

JU Yang,FENG Yihu,HU Zhaoping   

  1. College of Sciences,Shanghai University,Shanghai 200444,China
  • Received:2021-06-12 Accepted:2021-06-23

Abstract: In this paper,boundary value problem for a class of elliptic differential equations with a segment of turning points is considered.Firstly,using the method of multiple scales the formal asymptotic solution with turning points in constructed.And then,the uniform validity for the asymptotic expansion of the solution is proved by using the comparison theorem.

Key words: turning point, singular perturbation, elliptic differential system, boundary value problem, uniform validity

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