If the differential forms are somewhat immutable we may also save the result of is_zero once for all. Why do not make is_zero a cached_method of symbolic expressions ?
Best, Vincent -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/groups/opt_out.
