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

Table 1

Maximum absolute error of Example 1 before Richardson extrapolation for .

	8	16	32	64	128	256
	1.3808e − 03	3.4045e − 04	8.4818e − 05	2.1193e − 05	5.2970e − 06	1.3242e − 06
	1.7200e − 02	5.0151e − 03	1.4739e − 03	3.5993e − 04	9.0018e − 05	2.2464e − 05
	4.1828e − 02	2.6301e − 02	1.4357e − 02	6.0620e − 03	1.8873e − 03	5.0407e − 04
	4.1711e − 02	2.6194e − 02	1.4838e − 02	7.9779e − 03	4.1434e − 03	2.1118e − 03
	4.1704e − 02	2.6186e − 02	1.4834e − 02	7.9750e − 03	4.1418e − 03	2.1124e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	4.1703e − 02	2.6186e − 02	1.4833e − 02	7.9748e − 03	4.1417e − 03	2.1123e − 03
	0.6714	0.8200	0.8953	0.9452	0.9714	–