Le Thu, 13 May 2010 23:05:12 +0100,
Jaime Villate <villate at fe.up.pt> a ?crit :
> On Thu, 2010-05-13 at 23:00 +0100, Jaime Villate wrote:
> > (to obtain its formal series equivalent \sum a_nX^n, a_n being the
> > > number of ways to pay n? using 1, 2 and 5? corners (no, there
> > > is no such thing as a 5? corner, but there's a 5? banknote !)).
> Oops, sorry; I did not read this part before my previous reply to your
> message. Then the partial fractions expansion that I told you is not
> what you need.
Yes it is, and I'm aware of the partfrac function. My problem is it
does only work in Q[X] : I would like to force the use of complex
roots, to decompose 1+x+x^2+x^3+x^4 into a product of factors X-w,
where w is one of the fifth roots of 1 distinct from 1.
So my question is : is there a way to work in an extension of Q(X) ?
\bye
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