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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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Ukrainian President Volodymyr Zelensky said in a video message on Tuesday that Ukrainian forces "destroy the invaders wherever we can." And while money initially moved into stocks in the morning, capital moved out of safe-haven assets. The price of the 10-year Treasury note fell Friday, sending its yield up to 2% from a March closing low of 1.73%. 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. After fleeing Russia, the brothers founded Telegram as a way to communicate outside the Kremlin's orbit. They now run it from Dubai, and Pavel Durov says it has more than 500 million monthly active users. Groups are also not fully encrypted, end-to-end. This includes private groups. Private groups cannot be seen by other Telegram users, but Telegram itself can see the groups and all of the communications that you have in them. All of the same risks and warnings about channels can be applied to groups.
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