Singular Manual: makeFormalDivisor

| #### D.15.11.11 makeFormalDivisor Procedure from library `divisors.lib` (see divisors_lib). Usage: makeFormalDivisor(L); L = list. Assume: L is a list of tuples of an integer and a divisor. Return: a formal divisor on X Theory: Represents an integer formal sum of divisors. Example:
    LIB "divisors.lib";
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    ==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
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    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));
    makeFormalDivisor(list(list(-5,A),list(2,B)));
    ==> -5*( (z,x) - (1) )
    ==> +2*( (y,x) - (1) )
    ==>

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