code: public static BigRational valueOf(BigInteger numerator, BigInteger denominator) {
  		return of(new BigDecimal(numerator), new BigDecimal(denominator));
  	}
docs: Creates a rational number of the specified numerator/denominator BigInteger values.
  
  @param numerator the numerator {@link BigInteger} value
  @param denominator the denominator {@link BigInteger} value (0 not allowed)
  @return the rational number
  @throws ArithmeticException if the denominator is 0 (division by zero)