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Table 5 Rate of convergence for Example 2

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

N\( \varepsilon ={\left(\frac{1}{N}\right)}^{0.25} \)\( \varepsilon ={\left(\frac{1}{N}\right)}^{0.5} \)\( \varepsilon ={\left(\frac{1}{N}\right)}^{0.75} \)\( \varepsilon ={\left(\frac{1}{N}\right)}^{1.0} \)
166.18206.15625.82804.8325
326.05915.96435.35673.2883
646.02845.84454.64233.3898
1286.09544.04913.88703.4309