From: A new approach of superconvergence analysis of a low order nonconforming MFEM for reaction–diffusion equation
m × m
\(\|u^{n}-U^{n}_{h}\|_{1,h}\)
Order
\(\|U^{n}_{h}-I_{h}u^{n}\|_{1,h}\)
20 × 20
0.0144
—
0.6725 × 10−3
40 × 40
0.0072
0.9999
0.1679 × 10−3
2.0021
80 × 80
0.0036
1.0000
0.0420 × 10−3
1.9996