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Была неизвестна точная оценка, при каком минимальном A можно из прямоугольника 1 на A склеить лист Мёбиуса и изометрично (не растягивая и не сжимая) вложить (то есть без углов) в трёхмерное пространство (см. и книжку Математический дивертисмент). Я много где студентам и школьникам про это рассказывал, рекламировал.
А недавно Ричард Шварц доказал, что оценка A>√3 оптимальная (видео).
Была неизвестна точная оценка, при каком минимальном A можно из прямоугольника 1 на A склеить лист Мёбиуса и изометрично (не растягивая и не сжимая) вложить (то есть без углов) в трёхмерное пространство (см. и книжку Математический дивертисмент). Я много где студентам и школьникам про это рассказывал, рекламировал.
А недавно Ричард Шварц доказал, что оценка A>√3 оптимальная (видео).
Given the pro-privacy stance of the platform, it’s taken as a given that it’ll be used for a number of reasons, not all of them good. And Telegram has been attached to a fair few scandals related to terrorism, sexual exploitation and crime. Back in 2015, Vox described Telegram as “ISIS’ app of choice,” saying that the platform’s real use is the ability to use channels to distribute material to large groups at once. Telegram has acted to remove public channels affiliated with terrorism, but Pavel Durov reiterated that he had no business snooping on private conversations. Investors took profits on Friday while they could ahead of the weekend, explained Tom Essaye, founder of Sevens Report Research. Saturday and Sunday could easily bring unfortunate news on the war front—and traders would rather be able to sell any recent winnings at Friday’s earlier prices than wait for a potentially lower price at Monday’s open. Also in the latest update is the ability for users to create a unique @username from the Settings page, providing others with an easy way to contact them via Search or their t.me/username link without sharing their phone number. "For Telegram, accountability has always been a problem, which is why it was so popular even before the full-scale war with far-right extremists and terrorists from all over the world," she told AFP from her safe house outside the Ukrainian capital. 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.
from fr
