#### D.15.5.9 linearlyEquivalent

Procedure from library `divisors.lib` (see divisors_lib).

Usage:
  linearlyEquivalent(A,B); A = divisor, B = divisor.

Assume:
  A and B are divisors on X.

Return:
  list if A and B a linearly equivalent and int 0 otherwise.

Theory:
  Checks whether A-B is principle. If yes, returns a list L=(f,g) where A - B = (f/g).

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));
    linearlyEquivalent(A,B);
    linearlyEquivalent(multdivisor(2,A),multdivisor(2,B));

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