Figure 1

3D view of the relationship between difference and ratio. Equation 2 at v = 300. The saddle point of this hyperbolic paraboloid is {u = x – v·y = 0, x = 0, x/y = 300}.
3D view of the relationship between difference and ratio. Equation 2 at v = 300. The saddle point of this hyperbolic paraboloid is {u = x – v·y = 0, x = 0, x/y = 300}.