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\sqrt{r^2 + (vt)^2} = r \sqrt{1 + (vt/r)^2} = r + (1/2) (vt)^2 / r + o(t^2),
так что вторая производная равна

v^2/r = (vr)^2 / r^3.

Числитель — (vr)^2 — это квадрат углового момента. Так что он вдоль орбиты всегда один и тот же!
А знаменатель r^3 — как раз и соответствует закону всемирного тяготения: куб, как и раньше. Так что, если взять константу
l = (vr)^2/ (GM),
то для разницы (r-l) будет
(r-l)’’ = r’’ = hr + (vr)^2 / r^3
= - GM r / r^3 + (vr)^2 / r^3
= - GM / r^3 * (r- l)
= h (r-l).

Так что трёхмерный вектор R = (x,y,r-l) подчиняется центральному закону
R’’ = h R, h = -GM/r^3.

Ура — теорема доказана!



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\sqrt{r^2 + (vt)^2} = r \sqrt{1 + (vt/r)^2} = r + (1/2) (vt)^2 / r + o(t^2),
так что вторая производная равна

v^2/r = (vr)^2 / r^3.

Числитель — (vr)^2 — это квадрат углового момента. Так что он вдоль орбиты всегда один и тот же!
А знаменатель r^3 — как раз и соответствует закону всемирного тяготения: куб, как и раньше. Так что, если взять константу
l = (vr)^2/ (GM),
то для разницы (r-l) будет
(r-l)’’ = r’’ = hr + (vr)^2 / r^3
= - GM r / r^3 + (vr)^2 / r^3
= - GM / r^3 * (r- l)
= h (r-l).

Так что трёхмерный вектор R = (x,y,r-l) подчиняется центральному закону
R’’ = h R, h = -GM/r^3.

Ура — теорема доказана!

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The Security Service of Ukraine said in a tweet that it was able to effectively target Russian convoys near Kyiv because of messages sent to an official Telegram bot account called "STOP Russian War." The message was not authentic, with the real Zelenskiy soon denying the claim on his official Telegram channel, but the incident highlighted a major problem: disinformation quickly spreads unchecked on the encrypted app. Telegram does offer end-to-end encrypted communications through Secret Chats, but this is not the default setting. Standard conversations use the MTProto method, enabling server-client encryption but with them stored on the server for ease-of-access. This makes using Telegram across multiple devices simple, but also means that the regular Telegram chats you’re having with folks are not as secure as you may believe. What distinguishes the app from competitors is its use of what's known as channels: Public or private feeds of photos and videos that can be set up by one person or an organization. The channels have become popular with on-the-ground journalists, aid workers and Ukrainian President Volodymyr Zelenskyy, who broadcasts on a Telegram channel. The channels can be followed by an unlimited number of people. Unlike Facebook, Twitter and other popular social networks, there is no advertising on Telegram and the flow of information is not driven by an algorithm. Friday’s performance was part of a larger shift. For the week, the Dow, S&P 500 and Nasdaq fell 2%, 2.9%, and 3.5%, respectively.
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