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مقدمه سخنران: بررسی گره ها در فضای ۳ بعدی داستانی طولانی دارد. ساختاری ریاضی برای این مطالعه در قرن 19 شکل گرفت و برخی از قضایای جالب در نیمه اول قرن 20 به اثبات رسید. با این وجود، شاید تحولات مهمتر در اواخر قرن بیستم و همچنین سال‌های گذشته‌ی هزاره جدید رخ داد. ما برخی از مراحل اصلی، از جمله برخی از ابزارهای جدید توسعه یافته برای مطالعه گره‌ها و پیوندها، و همچنین برخی از سوالات باز در این زمینه را با عبارات نسبتا ساده مرور خواهیم کرد.
مقدمه سخنران: بررسی گره ها در فضای ۳ بعدی داستانی طولانی دارد. ساختاری ریاضی برای این مطالعه در قرن 19 شکل گرفت و برخی از قضایای جالب در نیمه اول قرن 20 به اثبات رسید. با این وجود، شاید تحولات مهمتر در اواخر قرن بیستم و همچنین سال‌های گذشته‌ی هزاره جدید رخ داد. ما برخی از مراحل اصلی، از جمله برخی از ابزارهای جدید توسعه یافته برای مطالعه گره‌ها و پیوندها، و همچنین برخی از سوالات باز در این زمینه را با عبارات نسبتا ساده مرور خواهیم کرد.
Just days after Russia invaded Ukraine, Durov wrote that Telegram was "increasingly becoming a source of unverified information," and he worried about the app being used to "incite ethnic hatred." Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. Meanwhile, a completely redesigned attachment menu appears when sending multiple photos or vides. Users can tap "X selected" (X being the number of items) at the top of the panel to preview how the album will look in the chat when it's sent, as well as rearrange or remove selected media. On December 23rd, 2020, Pavel Durov posted to his channel that the company would need to start generating revenue. In early 2021, he added that any advertising on the platform would not use user data for targeting, and that it would be focused on “large one-to-many channels.” He pledged that ads would be “non-intrusive” and that most users would simply not notice any change. Right now the digital security needs of Russians and Ukrainians are very different, and they lead to very different caveats about how to mitigate the risks associated with using Telegram. For Ukrainians in Ukraine, whose physical safety is at risk because they are in a war zone, digital security is probably not their highest priority. They may value access to news and communication with their loved ones over making sure that all of their communications are encrypted in such a manner that they are indecipherable to Telegram, its employees, or governments with court orders.
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