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TableĀ 2 Errors, convergence orders and CPU time for Example 2

From: A priori error analysis of stabilized mixed finite element method for reaction-diffusion optimal control problems

Mesh \(\boldsymbol {\|u-u_{h}\|_{L^{2}(\Omega)}}\) Order \(\boldsymbol {|\!|\!|\{y-y_{h},\sigma-\sigma _{h}\}|\!|\!|_{\delta}}\) Order CPU time
8*8 7.1264E-02 - 9.5403E-02 - 8s
16*16 3.5255E-02 1.02 4.6587E-02 1.03 37s
32*32 1.7583E-02 1.00 2.3046E-02 1.02 172s
64*64 8.7859E-03 1.00 1.1465E-02 1.01 973s