|
|
D.5.4.2 divisorplus
Procedure from library divisors.lib (see divisors_lib).
- Usage:
- divisorplus(A ,B); A + B; A = divisor, B = divisor.
- Assume:
- A and B are divisors on X.
- Return:
- a divisor on X
- Theory:
- The procedure will compute the product of the numerator
and denominator ideals, respectively.
Example:
| | LIB "divisors.lib";
ring r=31991,(x,y,z),dp;
ideal I = y^2*z - x*(x-z)*(x+3*z);
qring Q = std(I);
divisor A = makeDivisor(ideal(x,z),ideal(1));
divisor B = makeDivisor(ideal(x,y),ideal(1));
A+B;
==> (x,yz) - (1)
==>
|
|
