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Table 1 Maximum absolute errors for Example 1 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 6.8161e−06 1.7125e−06 4.2918e−07 1.0743e−07 2.6988e−08
  1.9928 1.9964 1.9982 1.9930  
10−8 6.8161e−06 1.7125e−06 4.2918e−07 1.0743e−07 2.6988e−08
  1.9928 1.9964 1.9982 1.9930  
10−12 6.8161e−06 1.7125e−06 4.2918e−07 1.0743e−07 2.6988e−08
  1.9928 1.9964 1.9982 1.9930  
10−16 6.8161e−06 1.7125e−06 4.2918e−07 1.0743e−07 2.6988e−08
  1.9928 1.9964 1.9982 1.9930  
10−20 6.8161e−06 1.7125e−06 4.2918e−07 1.0743e−07 2.6988e−08
  1.9928 1.9964 1.9982 1.9930