در این لینک می توانید به مجموعه متنوعی از درسنامه‌ها، یادداشت‌ها و کتاب‌های رایگان ریاضی تحت نظر انجمن ریاضی امریکا دست‌یابید. از دکتر علی شکیبازاده برای معرفی این مجموعه سپاس‌گزاریم.
در این لینک می توانید به مجموعه متنوعی از درسنامه‌ها، یادداشت‌ها و کتاب‌های رایگان ریاضی تحت نظر انجمن ریاضی امریکا دست‌یابید. از دکتر علی شکیبازاده برای معرفی این مجموعه سپاس‌گزاریم.
But the Ukraine Crisis Media Center's Tsekhanovska points out that communications are often down in zones most affected by the war, making this sort of cross-referencing a luxury many cannot afford. Telegram was co-founded by Pavel and Nikolai Durov, the brothers who had previously created VKontakte. VK is Russia’s equivalent of Facebook, a social network used for public and private messaging, audio and video sharing as well as online gaming. In January, SimpleWeb reported that VK was Russia’s fourth most-visited website, after Yandex, YouTube and Google’s Russian-language homepage. In 2016, Forbes’ Michael Solomon described Pavel Durov (pictured, below) as the “Mark Zuckerberg of Russia.” Andrey, a Russian entrepreneur living in Brazil who, fearing retaliation, asked that NPR not use his last name, said Telegram has become one of the few places Russians can access independent news about the war. "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. Some privacy experts say Telegram is not secure enough
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