private static T GreatestCommonDivisor <T>(T one, T two, IArithmetic <T> arithmetic)
{
T big = arithmetic.Max(arithmetic.Abs(one), arithmetic.Abs(two));
T small = arithmetic.Min(arithmetic.Abs(one), arithmetic.Abs(two));
T remainder = arithmetic.Modulo(big, small);
return(arithmetic.Equals(remainder, arithmetic.Zero) ? small : AdvancedMath.GreatestCommonDivisor(small, remainder, arithmetic));
}