Comment #8 on issue 2476 by [email protected]: nth order Derivative http://code.google.com/p/sympy/issues/detail?id=2476
To finish my point: subs() is always applied to the free symbols, not the internal ones. So substituting a derivative variable by any non-symbol will give a Subs(). Only when substituting for another symbol can the derivative be expressed without Subs().
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