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D.5.4.8 degreeDivisor
Procedure from library divisors.lib (see divisors_lib).
- Usage:
- degreeDivisor(A); A = divisor.
- Assume:
- A is a divisor on X.
- Return:
- The degree of A.
- Theory:
- We compute difference of the degrees of the numerator and denominator ideals.
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 P = makeDivisor(ideal(x,z),ideal(1));
degreeDivisor(P);
==> 1
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