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7.5.4.0. 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
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