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Table 1 Comparison of maximum absolute errors for Example 1

From: Fourth-order stable central difference with Richardson extrapolation method for second-order self-adjoint singularly perturbed boundary value problems

εN = 8N = 16N = 32N = 64N = 128N = 256
Present method  
 2−38.4257e− 081.3480e− 092.1109e− 113.3035e− 131.2490e− 147.4385e− 15
 2−58.5202e− 071.4078e− 082.2312e− 103.5109e− 125.4401e− 142.3620e− 14
 2−86.6238e− 051.6978e− 062.8399e− 084.5168e− 107.0878e− 121.0836e− 13
 2−124.5141e− 034.1790e− 042.1462e− 059.9671e− 071.8913e− 083.0955e− 10
Method in [16]   
 2−31.44e− 033.64e− 049.06e− 052.26e− 055.66e− 061.41e− 06
 2−53.71e− 038.57e− 042.08e− 045.09e− 051.26e− 053.16e− 06
 2−84.63e− 031.65e− 032.33e− 046.09e− 051.73e− 054.37e− 06
 2−126.76e− 023.76e− 027.40e− 036.17e− 043.54e− 054.74e− 06