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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 users are able to send files of any type up to 2GB each and access them from any device, with no limit on cloud storage, which has made downloading files more popular on the platform. Additionally, investors are often instructed to deposit monies into personal bank accounts of individuals who claim to represent a legitimate entity, and/or into an unrelated corporate account. To lend credence and to lure unsuspecting victims, perpetrators usually claim that their entity and/or the investment schemes are approved by financial authorities. Stocks closed in the red Friday as investors weighed upbeat remarks from Russian President Vladimir Putin about diplomatic discussions with Ukraine against a weaker-than-expected print on U.S. consumer sentiment. The last couple days have exemplified that uncertainty. On Thursday, news emerged that talks in Turkey between the Russia and Ukraine yielded no positive result. But on Friday, Reuters reported that Russian President Vladimir Putin said there had been some “positive shifts” in talks between the two sides. "There are several million Russians who can lift their head up from propaganda and try to look for other sources, and I'd say that most look for it on Telegram," he said.
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Telegram Непрерывное математическое образование
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