Comment #4 on issue 2245 by pr...@goodok.ru: assumption while canceling the
polynomials
http://code.google.com/p/sympy/issues/detail?id=2245
Yes, the variant with meaning like "cancel all what you can, in spite of
everything" must be present too.
But sometimes the method `simplify` of expression, (therefore the method
`cancel` for the ratio of polynomials), is called without the user's
permissions, in many places, e.g. in `solve()` procedure.
And you are right `solve()` is rather issue 1694, I will see it later.
In other words, there are places in core, where incorrect result might be
occured after simplification.
And, conversely, there are places in core, where simplification is not used
(but would be better if it used) because uncontrollable simplification can
yield incorrect result.
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