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One can write $$1+\frac12+\frac13+\cdots+\frac1n=\gamma+\psi(n+1)$$ where $\gamma$ is Euler's constant and $\psi$ is the digamma function. Of course, one reason for creating the …

Nov 28, 2019 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …

Jun 12, 2025 · 1、华为 作为国民品牌的华为，基本上是家喻户晓的，除了华为公司知名度高、实力雄厚之外，它的手机确实很值得称赞。 华为手机不论是是高端机还是低端机，在机子的做工 …

知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业 …

Jan 15, 2013 · The main reason that it takes so long to get to $1+1=2$ is that Principia Mathematica starts from almost nothing, and works its way up in very tiny, incremental steps. …

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除了功能修复，iOS 18.4.1还针对两个高危漏洞进行了修补，第一个是CoreAudio组件漏洞：攻击者可通过恶意音频文件触发内存损坏，进而远程执行代码。 这一漏洞可能通过伪装成音乐或播 …

知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业 …

红线是n-1到n的割线，绿线是n处的切线. 图像上显然，割线的斜率大于切线的斜率。 ...

$\begingroup$ The theorem that $\binom{n}{k} = \frac{n!}{k!(n-k)!}$ already assumes $0!$ is defined to be $1$. Otherwise this would be restricted to $0 <k < n$. A reason that we do define …