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Table 3 Maximum absolute errors for Example 2 at number of mesh points 2N

From: Accelerated fitted operator finite difference method for singularly perturbed delay differential equations with non-local boundary condition

ε

N = 32

N = 64

N = 128

N = 256

N = 512

10−4

3.5556e−05

8.7577e−06

2.1733e−06

5.4134e−07

1.3509e−07

 

2.0215

2.0107

2.0053

2.0026

 

10−8

3.5556e−05

8.7577e−06

2.1733e−06

5.4134e−07

1.3509e−07

 

2.0215

2.0107

2.0053

2.0026

 

10−12

3.5556e−05

8.7577e−06

2.1733e−06

5.4134e−07

1.3509e−07

 

2.0215

2.0107

2.0053

2.0026

 

10−16

3.5556e−05

8.7577e−06

2.1733e−06

5.4134e−07

1.3509e−07

 

2.0215

2.0107

2.0053

2.0026

 

10−20

3.5556e−05

8.7577e−06

2.1733e−06

5.4134e−07

1.3509e−07

 

2.0215

2.0107

2.0053

2.0026