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7.7.8.0. shiftPoly
Procedure from library freegb.lib (see freegb_lib).
- Usage:
- shiftPoly(p,i); p letterplace poly, i int
- Return:
- poly
- Assume:
- basering has letterplace ring structure
- Purpose:
- compute the i-th shift of letterplace polynomial p
Example:
| | LIB "freegb.lib";
ring r = 0,(x,y,z),dp;
int uptodeg = 5; int lV = 3;
def R = makeLetterplaceRing(uptodeg);
setring R;
poly f = x(1)*z(2)*y(3) - 2*z(1)*y(2) + 3*x(1);
shiftPoly(f,1);
==> x(2)*z(3)*y(4)-2*z(2)*y(3)+3*x(2)
shiftPoly(f,2);
==> x(3)*z(4)*y(5)-2*z(3)*y(4)+3*x(3)
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