public static object BIDivide(BigInteger n, BigInteger d)
{
if (d.Equals(BigIntegerZero))
throw new ArithmeticException("Divide by zero");
BigInteger gcd = n.gcd(d);
if (gcd.Equals(BigIntegerZero))
return 0;
n = n.divide(gcd);
d = d.divide(gcd);
if (d.Equals(BigIntegerOne))
return reduce(n);
return new Ratio((d.signum() < 0 ? n.negate() : n),
(d.signum() < 0 ? d.negate() : d));
}
