| #### D.15.6.15 multformaldivisor Procedure from library `divisors.lib` (see divisors_lib). Usage: multformaldivisor(n ,A); A*n; n = integer, A = formaldivisor. Assume: n is an integer and A is a formal divisor on X. Return: a formal divisor on X Theory: The procedure will multiply the formal sum with n. 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));
    formaldivisor fE= makeFormalDivisor(list(list(-5,A),list(2,B)));
    fE*2;

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