Comment #5 on issue 2566 by ronan.l...@gmail.com: Equating Sums shouldn't
depend on dummy variables
http://code.google.com/p/sympy/issues/detail?id=2566
The traceback is because you used a set instead of a dict.
I wonder what result you expected. Lambda(1/y, 2/y) doesn't make sense and
if you wanted 2/y, you could just have called the function with Lambda(y,
2*y)(1/y).
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