Re: periodic generating function

[Ralf Stephan <gtrwst9@gmail.com>]

? poliscyclo(1+x+x^2)
%1 = 3
? poliscyclo(1+x+x^3)
%2 = 0

This is for C=1. However for example:

? factor(1-4*x^12)

%3 =

[2*x^6 - 1 1]

[2*x^6 + 1 1]

? poliscyclo(2*x^6 + 1)

%4 = 0

On Sun, May 15, 2016 at 9:18 AM Kevin Ryde <user42_kevin@yahoo.com.au> wrote:

To notice a periodic part in a generating function I think I want to
find whether a denominator polynomial is a divisor of 1 - C*x^p, for
some constant C and some power p.  What would be a good way to do that?

I got the effect I wanted by working upwards determining successive
terms of quotient until only a high term (or stop if too long).
Coefficients might be complex or quad and I'm happy for C to be
likewise.