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Математические этюды

В сюжете «Геометрия Лобачевского: интерактивная модель Пуанкаре в круге»
https://etudes.ru/etudes/Lobachevskian-geometry-Poincare-disk-model/
появились новые возможности.

Калейдоскоп одинаковых правильных многоугольников можно строить так, чтобы в центре абсолюта был центр одного из многоугольников, а можно таким образом, чтобы в центре абсолюта находилась вершина замощения.

И в том, и в другом случае получившиеся картины теперь можно сохранить в векторном формате PDF!

Напомним и о цикле гравюр Маурица Эшера «Circle Limit».

www.group-telegram.com/br/EtudesRu.com/783

4.9K viewsJan 21 at 16:04

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Create: 2025-01-21
Last Update: 2025-02-05 06:55:26

В сюжете «Геометрия Лобачевского: интерактивная модель Пуанкаре в круге»
https://etudes.ru/etudes/Lobachevskian-geometry-Poincare-disk-model/
появились новые возможности.

Калейдоскоп одинаковых правильных многоугольников можно строить так, чтобы в центре абсолюта был центр одного из многоугольников, а можно таким образом, чтобы в центре абсолюта находилась вершина замощения.

И в том, и в другом случае получившиеся картины теперь можно сохранить в векторном формате PDF!

Напомним и о цикле гравюр Маурица Эшера «Circle Limit».

BY Математические этюды

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Date: 2025-02-05|

At the start of 2018, the company attempted to launch an Initial Coin Offering (ICO) which would enable it to enable payments (and earn the cash that comes from doing so). The initial signals were promising, especially given Telegram’s user base is already fairly crypto-savvy. It raised an initial tranche of cash – worth more than a billion dollars – to help develop the coin before opening sales to the public. Unfortunately, third-party sales of coins bought in those initial fundraising rounds raised the ire of the SEC, which brought the hammer down on the whole operation. In 2020, officials ordered Telegram to pay a fine of $18.5 million and hand back much of the cash that it had raised. Channels are not fully encrypted, end-to-end. All communications on a Telegram channel can be seen by anyone on the channel and are also visible to Telegram. Telegram may be asked by a government to hand over the communications from a channel. Telegram has a history of standing up to Russian government requests for data, but how comfortable you are relying on that history to predict future behavior is up to you. Because Telegram has this data, it may also be stolen by hackers or leaked by an internal employee. Two days after Russia invaded Ukraine, an account on the Telegram messaging platform posing as President Volodymyr Zelenskiy urged his armed forces to surrender. Asked about its stance on disinformation, Telegram spokesperson Remi Vaughn told AFP: "As noted by our CEO, the sheer volume of information being shared on channels makes it extremely difficult to verify, so it's important that users double-check what they read." 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."
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