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Asymptotic Expansion of Solutions to Singular Perturbation Problems in Critical Cases
  
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KeyWord:Singularly perturbed problem, critical case, boundary function method, approximate solution
Author NameAffiliation
Hao Zhang College of Sciences, Shanghai Institute of Technology, Shanghai, 201418, China 
Na Wang College of Sciences, Shanghai Institute of Technology, Shanghai, 201418, China 
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Abstract:
      This paper investigates the problem of singular perturbed integral initial values and Robin boundary values in the critical case. Based on the boundary layer function method, we not only construct the asymptotic approximation of the original equation, but also prove the uniform validity of the asymptotic solution by successive approximation. At the same time, we give an example to prove the validity of the theoretical results.