For piecewise, it'll have to try out all possibilities i.e. substitute -1 and 1 for every sign(var) instance.
It would be better if we could modify the _contains method and make it smarter to include such cases(?) -- You received this message because you are subscribed to the Google Groups "sympy" 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/sympy. For more options, visit https://groups.google.com/groups/opt_out.
