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2) Раздел про три геометрии —
https://etudes.ru/etudes/Euclidean-spherical-Lobachevskian-geometries/ —
с плакатами (и файлами для скачивания!).

И интерактивный раздел, где в модели Пуанкаре в диске можно с геометрией Лобачевского поэкспериментировать —
https://etudes.ru/etudes/Lobachevskian-geometry-Poincare-disk-model/ ; если справа-сверху у рисунка есть мышка с подсвеченной левой кнопкой — точки на нём можно двигать!

На скриншотах: пучок прямых, проходящих через жёлтую точку и не пересекающих белую; иллюстрации к повороту и к гиперболическому движению (сдвиг вдоль прямой); и — паркет из одинаковых правильных треугольников, сходящихся по 7 в каждой вершине + двойственный паркет из правильных семиугольников.
www.group-telegram.com/de/mathtabletalks.com/4635
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2) Раздел про три геометрии —
https://etudes.ru/etudes/Euclidean-spherical-Lobachevskian-geometries/ —
с плакатами (и файлами для скачивания!).

И интерактивный раздел, где в модели Пуанкаре в диске можно с геометрией Лобачевского поэкспериментировать —
https://etudes.ru/etudes/Lobachevskian-geometry-Poincare-disk-model/ ; если справа-сверху у рисунка есть мышка с подсвеченной левой кнопкой — точки на нём можно двигать!

На скриншотах: пучок прямых, проходящих через жёлтую точку и не пересекающих белую; иллюстрации к повороту и к гиперболическому движению (сдвиг вдоль прямой); и — паркет из одинаковых правильных треугольников, сходящихся по 7 в каждой вершине + двойственный паркет из правильных семиугольников.

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If you initiate a Secret Chat, however, then these communications are end-to-end encrypted and are tied to the device you are using. That means it’s less convenient to access them across multiple platforms, but you are at far less risk of snooping. Back in the day, Secret Chats received some praise from the EFF, but the fact that its standard system isn’t as secure earned it some criticism. If you’re looking for something that is considered more reliable by privacy advocates, then Signal is the EFF’s preferred platform, although that too is not without some caveats. WhatsApp, a rival messaging platform, introduced some measures to counter disinformation when Covid-19 was first sweeping the world. Right now the digital security needs of Russians and Ukrainians are very different, and they lead to very different caveats about how to mitigate the risks associated with using Telegram. For Ukrainians in Ukraine, whose physical safety is at risk because they are in a war zone, digital security is probably not their highest priority. They may value access to news and communication with their loved ones over making sure that all of their communications are encrypted in such a manner that they are indecipherable to Telegram, its employees, or governments with court orders. But Telegram says people want to keep their chat history when they get a new phone, and they like having a data backup that will sync their chats across multiple devices. And that is why they let people choose whether they want their messages to be encrypted or not. When not turned on, though, chats are stored on Telegram's services, which are scattered throughout the world. But it has "disclosed 0 bytes of user data to third parties, including governments," Telegram states on its website. Pavel Durov, a billionaire who embraces an all-black wardrobe and is often compared to the character Neo from "the Matrix," funds Telegram through his personal wealth and debt financing. And despite being one of the world's most popular tech companies, Telegram reportedly has only about 30 employees who defer to Durov for most major decisions about the platform.
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2) Раздел про три геометрии —

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