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

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