 potentials. First I have written down some notation here just for reference, extension, and here is something from the first project that I had to manage right here. So we can always find one unique matrix procedure. Yes, exactly. Then it must be ordered or something. Yes, so, again, so I'm explaining what I'm like, so I'm going to order. So I get an order of two coefficients. So you have one plus two, and then you compare the difference. For this equation, on zero, then we have a well-defined gradient term and a degree of gradient term. So we collect all of such in-term coefficient one, so we collect all of them on it. We can always find a sequence. And here the norm can either be the value infinity norm induced by five, or the value two norm are actually unity-speed matrix will be defined by this potential where P is 80. You have the same process and get the difference. So we are going to find the interior of this standard syntax. Reception potential will be in this. So now we need to look at all the geodesics matrix. So any geodesic will be in this one. For example, some discussions. It defines the torus transformation. Although our charge changes into spaces where the base is the same, we are still in the torus. So we subdivide into disjoint union of these spaces.