in 系统 and written by samcompu

Fedora 在安装软件或者更新系统时,可能会出现类似以下的错误:警告:/var/cache/dnf/fedora-022e0d5fd8a6b38e/packages/gcc-7.1.1-3.fc26.x86_64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID 64...

in 闲杂 and written by CYJian

in 算法分析 and written by samcompu

$$\pi (x) \sim \frac{x}{\ln x}$$

in 题解 and written by CYJian

引入公式上次我们看到了这三个式子:$$ 1-1+1-1+1-1+1-1+...=?\\ 1-2+3-4+5-6+7-8+...=?\\ 1+2+3+4+5+6+7+8+...=? $$你有没有想出来呢??题目在这里