src/org/kocakosm/pitaya/math/Fraction.java
public Fraction negated()
	{
		if (d.signum() < 0) {
			return new Fraction(n, d.negate());
		}
		return new Fraction(n.negate(), d);
	}
public Fraction negated()
	{
		if (d.signum() < 0) {
			return new Fraction(n, d.negate());
		}
		return new Fraction(n.negate(), d);
	}
Returns the opposite of this {@code Fraction}. The result is not
reduced before being returned.

@return {@code -this}.