Field Elements
All polynomial computations in APU are done over field elements of different types. APU supports different types of fields (some of which strictly speaking do not constitute fields in the mathematical sense) including integers modulo a prime, fixed-precision floating point, straight-line programs etc. In addition to these types, the type Variable (which represents variables such as ``x1'') is also a defined to be a field type. Additionally, the user can add his own field type if required.