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D.5.4.5 normalForm
Procedure from librarydivisors.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.
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; ==> (x,yz) - (y,x) ==> normalForm(D); ==> (z,x) - (1) ==> |