Method negate

src/jvm/clojure/lang/Numbers.java:841–844

(Number x)

	//public Number subtract(Number x, Number y);
	final public Number negate(Number x){
		Ratio r = (Ratio) x;
		return new Ratio(r.numerator.negate(), r.denominator);
	}

	public Number inc(Number x){
		return Numbers.add(x, 1);