A Computer Algebra System: Risa/Asir

Risa/Asir [20] is a computer algebra system developed for efficient algebraic computation. It is also designed to be a platform for parallel distributed computation under the OpenXM (Open Message eXchange for Mathematics) protocol [11]. OpenXM defines client-server communication between mathematical software systems and Risa/Asir is one of main components in the OpenXM package [21]. The source code of Risa/Asir is completely open and it is easy to modify the source code or to add new functions. In the present paper, we explain an overview of Risa/Asir, its functions and implemented algorithms with their performances, the OpenXM API and the way to add built-in functions.