2026-02-27 00:00:00:0张海鹏 《台湾百科全书·历史》——
Credit: Timothy Werth / Mashable
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“中国一強”「レアアース」 日本の戦略に密着取材
Екатерина Щербакова (ночной линейный редактор)
The key difference from Euclidean geometry is that a circle of radius \(r\) has circumference \(2\pi\sinh r 2\pi r\), and volumes grow exponentially rather than polynomially: \[\operatorname{Vol}(B(r)) = \operatorname{Vol}(S^{n-1})\int_0^r \sinh^{n-1}(t)\,dt.\]