В пространстве легко расположить 6 кубов с попарно непересекающимися внутренностями так, чтобы каждые 2 соприкасались по многоугольнику ненулевой площади. Как доказать, что нельзя больше? Какое максимальное число произвольных тетраэдров можно расположить таким же образом? А произвольных выпуклых многогранников?
В пространстве легко расположить 6 кубов с попарно непересекающимися внутренностями так, чтобы каждые 2 соприкасались по многоугольнику ненулевой площади. Как доказать, что нельзя больше? Какое максимальное число произвольных тетраэдров можно расположить таким же образом? А произвольных выпуклых многогранников?
WhatsApp, a rival messaging platform, introduced some measures to counter disinformation when Covid-19 was first sweeping the world. The message was not authentic, with the real Zelenskiy soon denying the claim on his official Telegram channel, but the incident highlighted a major problem: disinformation quickly spreads unchecked on the encrypted app. That hurt tech stocks. For the past few weeks, the 10-year yield has traded between 1.72% and 2%, as traders moved into the bond for safety when Russia headlines were ugly—and out of it when headlines improved. Now, the yield is touching its pandemic-era high. If the yield breaks above that level, that could signal that it’s on a sustainable path higher. Higher long-dated bond yields make future profits less valuable—and many tech companies are valued on the basis of profits forecast for many years in the future. Recently, Durav wrote on his Telegram channel that users' right to privacy, in light of the war in Ukraine, is "sacred, now more than ever." In February 2014, the Ukrainian people ousted pro-Russian president Viktor Yanukovych, prompting Russia to invade and annex the Crimean peninsula. By the start of April, Pavel Durov had given his notice, with TechCrunch saying at the time that the CEO had resisted pressure to suppress pages criticizing the Russian government.
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