The program PEEI 4.0.0.0 calculates numerical
solutions of systems of partial differential
equations that have number of equations equal or
greater of the number of unknown functions. This
version 4.0.0.0 has the following improvements over
the previous ones. Have been improved the GUI, the
management of the execution and the execution itself.
Was made available the choice between two different
methods of resolution of the total system of
equations, labeled "normal method" and "other method".
The "normal method" is essentially the same of the
previous versions, but have been improved its
performance and its termination criterion. The "other
method" is based on the "interval analysis" and,
although is generally slower, has the advantage of
being able to calculate always the best solution.

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