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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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Apparently upbeat developments in Russia's discussions with Ukraine helped at least temporarily send investors back into risk assets. Russian President Vladimir Putin said during a meeting with his Belarusian counterpart Alexander Lukashenko that there were "certain positive developments" occurring in the talks with Ukraine, according to a transcript of their meeting. Putin added that discussions were happening "almost on a daily basis." Multiple pro-Kremlin media figures circulated the post's false claims, including prominent Russian journalist Vladimir Soloviev and the state-controlled Russian outlet RT, according to the DFR Lab's report. 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. In a statement, the regulator said the search and seizure operation was carried out against seven individuals and one corporate entity at multiple locations in Ahmedabad and Bhavnagar in Gujarat, Neemuch in Madhya Pradesh, Delhi, and Mumbai. "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.
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