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D.5.4.12 evaluateFormalDivisor

Procedure from library divisors.lib (see divisors_lib).

Usage:
evaluateFormalDivisor(D); D = formal divisor.

Assume:
D is a formal divisor on X.

Return:
a divisor on X

Theory:
Will evaluate the formal sum.

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)));
evaluateFormalDivisor(fE);
==> (x,y2) - (z2,x2z)
==>