Comment #1 on issue 1907 by mattpap: Pow(..., evaluate=something) is broken
http://code.google.com/p/sympy/issues/detail?id=1907
It's all about the old assumptions engine:
In [1]: Pow(y, 2, evaluate=True)
Out[1]:
2
y
In [2]: _._assumptions
Out[2]: {evaluate: True}
The _assumptions property is used in computing hash of an object.
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