Comment #2 on issue 2425 by asmeurer: Pretty printing bug http://code.google.com/p/sympy/issues/detail?id=2425
By the way, making as_coeff_mul() satisfy that invariant ((-term).as_coeff_mul()[0] == -(term).as_coeff_mul()[0]) might be a good idea, but the question is how difficult would it be to fix it? The other option would be to add some hooks into the pretty printer to see if the expression already has a - in front of it, but that would be difficult to implement, so the former is preferred unless it too is difficult to do.
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