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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.

Математические байки
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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Telegram Gives Up On Crypto Blockchain Project

Durov said on his Telegram channel today that the two and a half year blockchain and crypto project has been put to sleep. Ironically, after leaving Russia because the government wanted his encryption keys to his social media firm, Durov’s cryptocurrency idea lost steam because of a U.S. court. “The technology we created allowed for an open, free, decentralized exchange of value and ideas. TON had the potential to revolutionize how people store and transfer funds and information,” he wrote on his channel. “Unfortunately, a U.S. court stopped TON from happening.”

2) Раздел про три геометрии —

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