Updates:
Summary: -LambertW(-1) is not real
Cc: [email protected]
Labels: Assumptions
Comment #1 on issue 2116 by nicolas.pourcelot: -LambertW(-1) is not real
http://code.google.com/p/sympy/issues/detail?id=2116
In fact, it's stranger that what I thought:
In isympy:
In [1]: import sympy
In [2]: sympy.__version__
Out[2]: 0.6.7-git
In [3]: LambertW(-1).is_real
In [4]: (-LambertW(-1)).is_real
Out[4]: True
In [5]: (-LambertW(-1)).is_real
Out[5]: True
In [6]: complex(-LambertW(-1))
Out[6]: (0.318131505205-1.33723570143j)
In [7]: LambertW(-1).is_real
Out[7]: True
So, LambertW(-1).is_real first returned None, but after
-LambertW(-1).is_real was asked, it now returns True !
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