Comment #12 on issue 1932 by nicolas....@gmail.com: Relationals do not work with any methods of Expr
http://code.google.com/p/sympy/issues/detail?id=1932
I think adding two inequalities or differentiate them could be done without much pain using a Eq.as_expr() method, since Eq(a, b) can always be reduced to Eq(a - b, 0).
However, this is much difficult for non linear operations, like applying a non linear function, say sin(), to both members, since Eq(sin(a), sin(b)) is of course *not* the same than Eq(sin(a - b), 0) !
So, +1 for issue 1887 (both Eq() and Eqn() classes). -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
