One other possibility for symbolic systems when the question when the object in question cannot be simplified or evaluated, is to return the unsimplified or unevaluated expression. The simplest case might be something like
is (a>b) which, in the absence of any information about the values of a and b, just returns "itself" rather than an error or "unknown". -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
