Comment #3 on issue 2074 by [email protected]: dsolve(diff(D(t), t) - k1*(B + C2*exp(-k*t) - D(t)), D(t), 'nth_linear_constant_coeff_variation_of_parameters') gives AttributeError: 'tuple' object has no attribute 'match'
http://code.google.com/p/sympy/issues/detail?id=2074
@#2: Aaron, you're right about cmp_to_key. It was never intended to be a permanent solution anyway. I've opened an issue about that, see: http://code.google.com/p/sympy/issues/detail?id=267
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