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7.7.9.0. lpPower
Procedure from library freegb.lib (see freegb_lib).
- Usage:
- lpPower(f,n); f letterplace polynomial, int n
- Return:
- poly
- Assume:
- basering has a letterplace ring structure
- Purpose:
- compute the letterplace form of f^n
Example:
| | LIB "freegb.lib";
// define a ring in letterplace form as follows:
ring r = 0,(x(1),y(1),x(2),y(2),x(3),y(3),x(4),y(4)),dp;
def R = setLetterplaceAttributes(r,4,2); // supply R with letterplace structure
setring R;
poly a = x(1)*y(2) + y(1); poly b = y(1) - 1;
lpPower(a,2);
==> x(1)*y(2)*x(3)*y(4)+y(1)*x(2)*y(3)+x(1)*y(2)*y(3)+y(1)*y(2)
lpPower(b,4);
==> y(1)*y(2)*y(3)*y(4)-4*y(1)*y(2)*y(3)+6*y(1)*y(2)-4*y(1)+1
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