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Вот такие. [9] N. Linial, R. Meshulam, and M. Rosenthal, Sum complexes – a new family of hypertrees, Discrete Comput. Geom 44 (2010), 622–636. https://arxiv.org/abs/0903.1359 (скриншот из https://arxiv.org/abs/1707.09271 )
с гомологиями пространств петель все ещё хуже: существует односвязный клеточный комплекс из 19 клеток, у которого в целочисленных гомологиях петель есть Z/n для всех n

https://www.researchgate.net/publication/38341618_A_Loop_Space_whose_Homology_Has_Torsion_of_All_Orders



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с гомологиями пространств петель все ещё хуже: существует односвязный клеточный комплекс из 19 клеток, у которого в целочисленных гомологиях петель есть Z/n для всех n

https://www.researchgate.net/publication/38341618_A_Loop_Space_whose_Homology_Has_Torsion_of_All_Orders

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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. The fake Zelenskiy account reached 20,000 followers on Telegram before it was shut down, a remedial action that experts say is all too rare. Emerson Brooking, a disinformation expert at the Atlantic Council's Digital Forensic Research Lab, said: "Back in the Wild West period of content moderation, like 2014 or 2015, maybe they could have gotten away with it, but it stands in marked contrast with how other companies run themselves today." Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. 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.
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