Задача 53: Автор - Пучков Пëтр Источник - Олимпиада по геометрии имени Шарыгина 2024, задача 9.4
При каких n на плоскости можно отметить несколько точек и окружностей так, что выполнены условия: - На каждой окружности лежит ровно n точек - Через каждую точку проходит ровно n окружностей - У каждой окружности отмечен центр
Задача 53: Автор - Пучков Пëтр Источник - Олимпиада по геометрии имени Шарыгина 2024, задача 9.4
При каких n на плоскости можно отметить несколько точек и окружностей так, что выполнены условия: - На каждой окружности лежит ровно n точек - Через каждую точку проходит ровно n окружностей - У каждой окружности отмечен центр
BY NeuroGeometry
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Two days after Russia invaded Ukraine, an account on the Telegram messaging platform posing as President Volodymyr Zelenskiy urged his armed forces to surrender. At its heart, Telegram is little more than a messaging app like WhatsApp or Signal. But it also offers open channels that enable a single user, or a group of users, to communicate with large numbers in a method similar to a Twitter account. This has proven to be both a blessing and a curse for Telegram and its users, since these channels can be used for both good and ill. Right now, as Wired reports, the app is a key way for Ukrainians to receive updates from the government during the invasion. Ukrainian President Volodymyr Zelensky said in a video message on Tuesday that Ukrainian forces "destroy the invaders wherever we can." Sebi said data, emails and other documents are being retrieved from the seized devices and detailed investigation is in progress. "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.
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