Updates:
Labels: -EasyToFix
Comment #1 on issue 2446 by [email protected]: as_dummy fails when
symbol assumptions are set
http://code.google.com/p/sympy/issues/detail?id=2446
Now I'm not so certain if this is easy to fix. One can not mess with
self.assumptions0, but changing the argument name to something different
from 'commutative' in Dummy() would change the user-interface and be
inconsistent with the interface of Symbol().
What I don't really understand is: why use a explicit flag
commutative=True, instead of giving this a default value inside the
function? The "is_commutative" variable is supposed to be in sync (or at
least never contradict) assumptions['commutative'], right?
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