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у тетраэдра группа вращений — PSL_2(F_3), у икосаэдра — PSL_2(F_5), а как собрать из треугольников нечто регулярное с группой симметрий PSL_2(F_7)?

картинки на выходные пусть будут про квартику Клейна и ее симметрии, http://www.gregegan.net/SCIENCE/KleinQuartic/KleinQuartic.html (выше — одна из них)



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у тетраэдра группа вращений — PSL_2(F_3), у икосаэдра — PSL_2(F_5), а как собрать из треугольников нечто регулярное с группой симметрий PSL_2(F_7)?

картинки на выходные пусть будут про квартику Клейна и ее симметрии, http://www.gregegan.net/SCIENCE/KleinQuartic/KleinQuartic.html (выше — одна из них)

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Telegram | DID YOU KNOW?

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At its heart, Telegram is little more than a messaging app like WhatsApp or Signal. But it also offers open channels that enable a single user, or a group of users, to communicate with large numbers in a method similar to a Twitter account. This has proven to be both a blessing and a curse for Telegram and its users, since these channels can be used for both good and ill. Right now, as Wired reports, the app is a key way for Ukrainians to receive updates from the government during the invasion. But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. 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. NEWS Unlike Silicon Valley giants such as Facebook and Twitter, which run very public anti-disinformation programs, Brooking said: "Telegram is famously lax or absent in its content moderation policy."
from ar


Telegram Непрерывное математическое образование
FROM American