Updates:
Status: Fixed
Comment #4 on issue 2416 by smi...@gmail.com: Exponential function
exp(I*k**2*pi) simplifies to -1
http://code.google.com/p/sympy/issues/detail?id=2416
k = Symbol('k', integer=True)
exp(I*k**2*pi)
exp(I*pi*k**2)
k = Symbol('k', integer=True, odd=True)
exp(I*k**2*pi)
-1
k = Symbol('k', integer=True, even=True)
exp(I*k**2*pi)
1
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