Do we have local minima or local maximum? When I say minima, it's just the plural of minimum. And maxima is just the plural of maximum. So do we have a local minima here or a local minimum here? Well, a local minimum, you could imagine, means that that value of the function at that point is lower than the points around it. So right over here, it looks like we have a local minimum. And I'm not giving you a very rigorous definition here, but one way to think about it is we can say that we have a local minimum point at x1 is if we have a region around x1 where f of x1 is less than an f of x for any x in this region right over here.