Dirk Laurie on Sun, 17 Jun 2012 19:48:23 +0200


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Lifting a quadgen 

Consider the following GP session.

? phi=quadgen(5)
%1 = w
? L(n)=phi^n+(-1/phi)^n
%2 = (n)->phi^n+(-1/phi)^n
? L6=L(6)
%3 = 18
? type(L6)
%4 = "t_QUAD"
? type(%3)
%5 = "t_INT"

Two questions.

- Why are %3 and L6 of different type?
- Can one lift L6 to t_INT except by ugly kludges like
   floor(1.*L6)?