Comment #31 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
It's there and the correction has been applied and tested:
from sympy import *
var('a b c')
(a, b, c)
(-I*a*b).subs(a*b,2)
-2*I
Thanks for the feedback on 2039. BTW, fraction is about to go back to its
old behavior so perhaps you will be able to test t2 with your work. The
more of a workout it gets the better it becomes.
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