Comment #6 on issue 1852 by smichr: "expand" fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
It passes everything in 1766, too...but the issue is also present for a
non-Add base:
(x*y)**3 -> x**3*y**3 instead of x*y*x*y*x*y
Also, in checking the coverage I see that the next line is uncovered:
return Add(*[f*multi for f in base.args])
This is dead code (I think) since the out if already restricted this
section to a
base that is an Add and expanding a non-commutative add is going to lead to
an Add.
((2*(x+3*y))**3).expand() doesn't expand fully on the first try in 1766:
((2*x*(a+3))**3).expand()
(6*x + 2*a*x)**3
_.expand()
216*x**3 + 8*a**3*x**3 + 72*a**2*x**3 + 216*a*x**3
I made an 1852 commit with the mul base and add base changes and am happy
to rebase
this on top of the commit that Raffaele does. Or I could just add his name
to the
commit (1852 in branch 1766).
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