Comment #1 on issue 1900 by mattpap: factor((1+2*x+x**2)**100) works too
hard
http://code.google.com/p/sympy/issues/detail?id=1900
The procedure is as follows:
1. Expand
2. Square-free factor
3. Factor
The first two take majority of time in this case. This is the most general
approach
and always successful. However, it would be great if factor() (and other
polynomial
manipulation function) could take advantage of the input form of an
expression. In
this case we get a square-free expression with expanded base, so it should
be as
simple as factoring the base and putting result together. For this we need
need
another expression parser that will understand when expression should be
factored,
when expanded etc. I planned to add this feature for a long time, but there
was
always something more important to do first.
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