Higher-Order Uniformly Convergent Numerical Scheme for Singularly Perturbed Differential Difference Equations with Mixed Small Shifts

Table 7

Maximum absolute error of Example 4 before Richardson extrapolation for .

	8	16	32	64	128	256
	9.0320e − 03	4.5788e − 03	2.2918e − 03	1.1469e − 03	5.7338e − 04	2.8666e − 04
	3.7979e − 02	1.6150e − 02	6.1639e − 03	2.4525e − 03	1.0562e − 03	4.8456e − 04
	4.3631e − 02	2.4943e − 02	1.3421e − 02	6.9160e − 03	3.1649e − 03	1.2055e − 03
	4.3723e − 02	2.4996e − 02	1.3451e − 02	7.0011e − 03	3.5749e − 03	1.8068e − 03
	4.3728e − 02	2.4999e − 02	1.3452e − 02	7.0020e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	4.3729e − 02	2.4999e − 02	1.3452e − 02	7.0021e − 03	3.5755e − 03	1.8071e − 03
	0.8067	0.8940	0.9420	0.9696	0.9845	–