|  |  7.5.4.0. reiffen Procedure from librarydmod.lib(see  dmod_lib).
 
Example: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 setringcommand andfind the curve as a polynomial RC.
 A Reiffen curve is defined as RC = x^p + y^q + xy^{q-1}, q >= p+1 >= 5
 
 |  | LIB "dmod.lib";
def r = reiffen(4,5);
setring r;
RC;
==> xy4+y5+x4
 | 
 
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