Comment #18 on issue 1497 by [email protected]: Remove automatic
distribution 2*(x + y) => 2*x + 2*y
http://code.google.com/p/sympy/issues/detail?id=1497
nc means "noncommutative", so it deals with noncommutative Symbols
(Symbol('A', commutative=False). I guess that is just preventing
distribution for noncommutative things. It shouldn't make a difference,
because you are going to remove all automatic distribution for everything.
You can probably get more information about this change by using git blame
and seeing what commit caused this change.
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