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We consider Poisson's equation on the unit square with a nonlocal boundary condition. The existence and uniqueness of its weak solution in Sobolev space $H^1$ is proved. A finite difference scheme approximating this problem is proposed. An error estimate compatible with the smoothness of input data in discrete $H^{1}$ Sobolev norm is obtained.

Finite difference approximation of an elliptic problem with nonlocal boundary condition