[GiNaC-list] Polynomial Factoring

[Charles White]

Hi GiNaC!
I love the library! Keep up the good work!

Currently I am trying to find exact eigenvalues. My solution so far is to
factor the characteristic equation then I can try to find roots of the
factored polynomials. But, I need a list of expressions that store the
factored polynomials.

For example in the ginsh I have:
```
> rat = pow(x,6)+1;
1+x^6
> factor(rat);
(1+x^4-x^2)*(1+x^2)
```
Then I need a list with the expressions (1+x^4-x^2) and (1+x^2); from there
I can calculate the roots exactly.

Is this possible? Is there a better way to find exact eigenvalues?

Thanks!
Charles
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