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D.15.5.5 normalForm
Procedure from library divisors.lib (see divisors_lib).
- Usage:
- normalForm(A); A = divisor.
- Assume:
- A is a divisor on X.
- Return:
- different representative of the same divisor on X
- Theory:
- The procedure will cancel common components of numerator and denominator.
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));
divisor D = (A+B)+multdivisor(-1,B);
D;
normalForm(D);
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