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https://math.ucr.edu/home/baez/klein.html

замощения сферы одинаковым правильными сферическими многоугольниками соответствуют правильным многогранникам

а что хорошего можно сделать из замощений плоскости Лобачевского?

если правильным образом их покрасить, а потом отождествить части одного цвета, можно получить интересные римановы поверхности

по ссылке объясняется, например, как таким образом получить квартику Клейна



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https://math.ucr.edu/home/baez/klein.html

замощения сферы одинаковым правильными сферическими многоугольниками соответствуют правильным многогранникам

а что хорошего можно сделать из замощений плоскости Лобачевского?

если правильным образом их покрасить, а потом отождествить части одного цвета, можно получить интересные римановы поверхности

по ссылке объясняется, например, как таким образом получить квартику Клейна

BY Непрерывное математическое образование


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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. Meanwhile, a completely redesigned attachment menu appears when sending multiple photos or vides. Users can tap "X selected" (X being the number of items) at the top of the panel to preview how the album will look in the chat when it's sent, as well as rearrange or remove selected media. Channels are not fully encrypted, end-to-end. All communications on a Telegram channel can be seen by anyone on the channel and are also visible to Telegram. Telegram may be asked by a government to hand over the communications from a channel. Telegram has a history of standing up to Russian government requests for data, but how comfortable you are relying on that history to predict future behavior is up to you. Because Telegram has this data, it may also be stolen by hackers or leaked by an internal employee. But Kliuchnikov, the Ukranian now in France, said he will use Signal or WhatsApp for sensitive conversations, but questions around privacy on Telegram do not give him pause when it comes to sharing information about the war. "He has to start being more proactive and to find a real solution to this situation, not stay in standby without interfering. It's a very irresponsible position from the owner of Telegram," she said.
from ua


Telegram Непрерывное математическое образование
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