Updates:
Labels: NeedsReview smichr
Comment #1 on issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
The use of the parallel keyword is possible in
https://github.com/sympy/sympy/pull/690 . This allows all substitutions to
take place before evaluation of affected sub-expressions, so if `r =
[(x,0),(y,0)]` then both `(x/y).subs(r, parallel=True])` and
`(x/y).subs(reversed(r), parallel=True])` will yield nan.
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