The figures refer to the model problem

This is *Laplace's equation* on the unit square.

The Dirichlet boundary values are chosen identical to 0 on the south, west, and north boundary. The east boundary function is chosen as

The true solution then becomes

This problem is
discretized by *five point difference
stencils*.

Ulrich Ruede , Thu Feb 2 21:05:00 MEZ 1995

Updated by Craig C. Douglas