Comment #3 on issue 3145 by pr...@goodok.ru: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
First of all, I think that it is problem in the assumption system or in the
cancellation or in the automatic simplification of a*1/S.Zero --> a*oo
a*1/S.Zero
oo*a
which the reason of the behaviour of example of substitution.
Implicitly this transformation assumes that a<>0.
So we must pay attention to this. And form it as the XFAIL test, I guess.
But the option `parrallel` or `simultaneous` is convenient. If we consider
it as the manual control of the substitution process to get around this bug.
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