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у Мат. Этюдов недавно появились разные картинки и разговоры на тему [модели Пуанкаре] плоскости Лобачевского

в частности, можно смотреть на разные замощения плоскости Лобаческого одинаковыми правильными многоугольниками



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https://etudes.ru/etudes/Lobachevskian-geometry-Poincare-disk-model/

у Мат. Этюдов недавно появились разные картинки и разговоры на тему [модели Пуанкаре] плоскости Лобачевского

в частности, можно смотреть на разные замощения плоскости Лобаческого одинаковыми правильными многоугольниками

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Telegram has become more interventionist over time, and has steadily increased its efforts to shut down these accounts. But this has also meant that the company has also engaged with lawmakers more generally, although it maintains that it doesn’t do so willingly. For instance, in September 2021, Telegram reportedly blocked a chat bot in support of (Putin critic) Alexei Navalny during Russia’s most recent parliamentary elections. Pavel Durov was quoted at the time saying that the company was obliged to follow a “legitimate” law of the land. He added that as Apple and Google both follow the law, to violate it would give both platforms a reason to boot the messenger from its stores. In 2014, Pavel Durov fled the country after allies of the Kremlin took control of the social networking site most know just as VK. Russia's intelligence agency had asked Durov to turn over the data of anti-Kremlin protesters. Durov refused to do so. "And that set off kind of a battle royale for control of the platform that Durov eventually lost," said Nathalie Maréchal of the Washington advocacy group Ranking Digital Rights. In 2018, Russia banned Telegram although it reversed the prohibition two years later. WhatsApp, a rival messaging platform, introduced some measures to counter disinformation when Covid-19 was first sweeping the world.
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