FDM for Elliptic Equations with Bitsadze-Samarskii-Dirichlet Conditions

Table 1

Comparison of the errors of difference schemes.

Difference schemes	𝑁=𝑀=20	𝑁=𝑀=40	𝑁=𝑀=60
First-order difference scheme (2.7)	0.05384197882300	0.02631633782987	0.01740639813932
Second-order difference scheme (2.8)	0.00631619894867	0.00164455475890	7.4144589892985e-004