Comment #2 on issue 2361 by [email protected]: Mul.flatten needs to watch
for the unevaluated Mul
http://code.google.com/p/sympy/issues/detail?id=2361
I guess you are right. To check that in a test, however, you either have to
build an unevaluated mul or compare something like fraction of the lhs and
rhs:
a=S(9)/4*z/(1-x) # a result
b=9*z/(4*(1-x)) # the test
a == b
False
fraction(a) == fraction(b)
True
But this needs to be fixed:
>>> u=Mul(2,1+x,evaluate=0)
>>> 2+u
2 + 2 + 2*x
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