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Table 3 Comparison of rate of convergence 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 = 64
With Richardson extrapolation
 2−55.91945.97955.98986.0121
 2−85.28595.90175.97445.9938
 2−123.43324.28334.42855.7197
Without Richardson extrapolation
 2−54.07474.02774.00614.0011
 2−83.60163.99803.99893.9997
 2−121.04722.25413.49333.9694