@Override
	public boolean equals(Object obj){
		if (obj == null)
			return false;
		if (obj == this)
			return true;
		if (!(obj instanceof deltaQ))
			return false;
		deltaQ another = (deltaQ)obj;
		if (another.i.u_id.equals(this.i.u_id) && another.j.u_id.equals(this.j.u_id) && another.dQ == this.dQ)
			return true;
		else
			return false;
	}