Comment #1 on issue 3262 by [email protected]: CSE loses factor
of I (imag. unit)
http://code.google.com/p/sympy/issues/detail?id=3262
Reduced version:
---------------------------------------------------
import sympy as sp
x = sp.Symbol("x")
xx = -sp.I*x
print xx._eval_subs(-x, sp.Symbol("y"))
---------------------------------------------------
prints "y", should be "I*y".
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