Table 2: 𝐿 2 -error and order of convergence in 𝑥 when 𝜇 = 1 . 8 .

𝐮 𝐮 𝐿 2 ( Ω )
Error Order

1/4 8 . 0 3 0 4 5 𝑒 0 3
1/8 2 . 2 8 9 5 9 𝑒 0 3 1.810
1/16 6 . 3 2 9 6 2 𝑒 0 4 1.855
1/32 1 . 7 6 4 0 6 𝑒 0 4 1.843