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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