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Theory and Modern Applications

Table 3 Second pure derivative approximation results

From: On a highly accurate approximation of the first and pure second derivatives of the Laplace equation in a rectangular parallelpiped

\(\boldsymbol{\frac{1}{h}}\)

\(\boldsymbol{\Vert w-w_{h}\Vert _{\overline{R}^{h}}}\)

\(\boldsymbol{E_{w}^{m}}\)

\(\frac{1}{8}\)

9.8243E − 7

15.21

\(\frac{1}{16}\)

6.4587E − 8

16.21

\(\frac{1}{32}\)

3.9850E − 9

16.36

\(\frac{1}{64}\)

2.4361E − 10

16.37

\(\frac{1}{128}\)

1.4879E − 11

Â