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Table 3 Error of p in example ( 53 )

From: Numerical solution to Bitsadze-Samarskii type elliptic overdetermined multipoint NBVP

Type of approximation N  =  M  = 20 N  =  M  = 40 N  =  M  = 80 N  =  M  = 160
First order 0.022091 0.010516 0.0051328 0.002536
Second order 3.64 × 10−4 9.48 × 10−5 2.40 × 10−5 6.05 × 10−6