Updates:
Status: Valid
Labels: NonCommutative Core
Comment #3 on issue 3791 by asmeu...@gmail.com: AttributeError: 'Mul'
object attribute 'is_commutative' is read-only, when a try to do
sympy.integrate()
http://code.google.com/p/sympy/issues/detail?id=3791
That's not right either, because commutative is part of the assumptions, so
the object's assumptions0 will be wrong:
In [11]: x.__class__.is_commutative = False
In [12]: x.is_commutative
Out[12]: False
In [13]: x.assumptions0
Out[13]: {commutative: True}
Can't we just pass **{'commutative':is_commutative} when creating the
object?
Also, this line is obviously not tested.
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