Somewhat buggy, and fails more often than Maxima does. Yacas - Unlike Maxima, is designed to be suitable for both interactive and noninteractive use.It's only suitable for interactice use e.g., if you do certain integrals, it will ask you whether a particular constant occurring in the integrand is positive. Maxima - In my experience, it's very mature and bug-free.For anyone who's specifically interested in OSS that runs on Linux, here are some of my impressions: Most of my analytical work on a daily basis is done using Maxima and I can safely say that the program could be a lot better than it currently is. (%i14) trigsimp(Q.trigsimp(T.transpose(Q))) Д¬omputer algebra systems are not the best to begin with, but Maxima has a very, very long way to go before it can compete with Mathematica. To reenable the Lisp debugger set *debugger-hook* to nil. Universal error handler called recursively (:ERROR NILД®rror in CONDITIONS::CLCS-UNIVERSAL-ERROR-HANDLER : Caught fatal error

See the file COPYING.Дedicated to the memory of William Schelter. Using Lisp GNU Common Lisp (GCL) GCL 2.6.8 (aka GCL)Дistributed under the GNU Public License. Here's a session from just this 14:45:36 ~]$ maxima

Mathematica 7