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7.7.4.0. reiffen
Procedure from library dmod.lib (see dmod_lib).

Usage:
reiffen(p, q); int p, int q

Return:
ring

Purpose:
set up the polynomial, describing a Reiffen curve

Note:
activate the output ring with the setring command and
find the curve as a polynomial RC.
A Reiffen curve is defined as RC = x^p + y^q + xy^{q-1}, q >= p+1 >= 5

Example:
 
LIB "dmod.lib";
def r = reiffen(4,5);
setring r;
RC;
==> xy4+y5+x4