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

Table 6

Maximum absolute error of Example 3 after Richardson extrapolation for .

	8	16	32	64	128	256
	2.7968e − 04	1.7366e − 05	1.0850e − 06	6.7812e − 08	4.2386e − 09	1.0101e − 09
	3.6872e − 03	2.1118e − 04	1.3152e − 05	8.2173e − 07	5.0203e − 08	1.2341e − 08
	2.9531e − 02	5.5516e − 03	3.3684e − 04	2.0489e − 05	1.2809e − 06	3.7125e − 07
	3.0553e − 02	9.4597e − 03	2.4698e − 03	3.8494e − 04	2.2756e − 05	4.8133e − 06
	3.0586e − 02	9.4718e − 03	2.5185e − 03	6.3984e − 04	1.5770e − 04	3.8042e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	3.0589e − 02	9.4725e − 03	2.5187e − 03	6.3989e − 04	1.6062e − 04	3.9001e − 05
	1.6912	1.9111	1.9768	1.9942	2.0421	–