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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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He floated the idea of restricting the use of Telegram in Ukraine and Russia, a suggestion that was met with fierce opposition from users. Shortly after, Durov backed off the idea. The next bit isn’t clear, but Durov reportedly claimed that his resignation, dated March 21st, was an April Fools’ prank. TechCrunch implies that it was a matter of principle, but it’s hard to be clear on the wheres, whos and whys. Similarly, on April 17th, the Moscow Times quoted Durov as saying that he quit the company after being pressured to reveal account details about Ukrainians protesting the then-president Viktor Yanukovych. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed. Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp.
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