## 2.3 Two dimensional Boundaries

In the subroutines that solve Helmholtz problems
in two dimensions ( HIBEM2, HEBEM2 and HMBEM2)
the boundaries must
be represented in the form illustrated in 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 programs HIBEM2_T,
HEBEM2_T and HMBEM2_T each solve Helmholtz
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 square figure below.

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