Am 15.11.2016 um 05:59 schrieb oldk1331: >> How about using List of EXPR as Rep? > > Second thought, it will not work, polynomial will still be expanded. > >> On the other hand, probably carrying it too far, one might use OutputForm >> which >> is very expressive and greatest possible "symbolic", if only there were a way >> back ;) > > Yes, something between OutputForm and Expression: it will keep the similarity > of its input form and have semantic to perform various operations. > > I wonder how other CASs choose expression's representation, I'll investigate > when I have more time. >
I'm aware of essentially two methods and their mixing: kernels and standard forms vs. term rewriting. Typical representatives of the former are the lisp based CAS (e.g. REDUCE) whereas YACAS (http://www.yacas.org/) is one of the latter. Maybe you'll find some others, especially regarding the "black boxes" I've not the faintest idea. -- You received this message because you are subscribed to the Google Groups "FriCAS - computer algebra system" group. To unsubscribe from this group and stop receiving emails from it, send an email to fricas-devel+unsubscr...@googlegroups.com. To post to this group, send email to fricas-devel@googlegroups.com. Visit this group at https://groups.google.com/group/fricas-devel. For more options, visit https://groups.google.com/d/optout.
