Updates: Labels: Documentation Comment #1 on issue 2198 by asmeurer: gotcha addons http://code.google.com/p/sympy/issues/detail?id=2198
I'm not sure if the non-commutative thing belongs in the gotchas. Maybe we should create a separate doc file for non-commutatives that explains all the handling, difference from commutative, etc.
The first one applies not just to expand, but to any method. For example, x**(a + b).subs(x, y) will return x**(a + b), not y**(a + b).
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