Comment #5 on issue 2082 by asmeurer: No SymPy class 'Composition' http://code.google.com/p/sympy/issues/detail?id=2082
So we need to make it raise an error whenever someone tries to derive from Add without the identity and zero?
-- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
