## 2.3 Two dimensional Boundaries

In the subroutine that solve Laplace problems
in two dimensions (
LIBEM2)
the boundaries must
be represented in the form illustrated in the figure below.
In order that the normal to the boundary points outward rather
than inward, the two nodes that define each element must
be listed in the clockwise direction around the boundary.
The program
LIBEM2_T
solves Laplace
problems in which the boundary under consideration is that of
a square of side 0.1. The boundary is represented by
32 uniform panels and also has 32 vertices, as illustrated in the squae figure below.

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