Is that Interval arithmetic???

Hello everybody!

As a part of a project, I implemented several scripts for solving ODEs, such as the explicit euler-sheme. Additionally, the arithmetical type can be chosen, such as floating point, fixed point and interval arithmetics. Interval arithmetic is simulated be using the mupad-engine, which is included in the symbolic matlab toolbox, so for example: to compute 3+4 in interval arithmetic, my matlab-scripts would do the following:

evalin(symengine,['hull(',num2str(3),')']) + evalin(symengine,['hull(',num2str(4),')'])

Is that really interval arithmetic such in: http://en.wikipedia.org/wiki/Interval_arithmetic ?????

Thank you very much in advance.

Bernhard