Not to be alone I am using Julia to compute some math and chatgpt AI to compute some integrals. Well, I saw this picture of circles and tried to understand why radars maximum has this kind of energy to catch the planes. Then I realized this tip on circles intersections. From there I had an idea of what is imag angle. And that is everything: tangent of this angle of intersection is 1 whis ich 100% of energy in pin point of radars intersection. Picture from Julia computation was: As we know tangent is a touching point of the function. Area under graph at tangent is real energy of this graph. And this energy is maximum at tips as correctly guessed Gauss and Ostrogradsky and many many after them ;) I was thinking a bit during breakfeast about an article in the news: China is able to catch F35 stealth. So logically what would you do as an engineer to make it stealth? Yes, yes, to deform angle pi/2 and how? What if F35 deformed circles towards ellypses. That is completely different function as mentioned ^^^ needles or peaks of radar. Seems to be F35 is deforming radar field by pulses of these peaks and gaps to create it ellypsed. And that is how Chinese catch us according to the newspapers :) Seems to be this lady is pretty old technology:

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