![integration - Prove $\int^{n+1}_1\frac{1}{x} dx \leq 1 + 1/2 + \cdots + 1/n$. - Mathematics Stack Exchange integration - Prove $\int^{n+1}_1\frac{1}{x} dx \leq 1 + 1/2 + \cdots + 1/n$. - Mathematics Stack Exchange](https://i.stack.imgur.com/VYJPt.png)
integration - Prove $\int^{n+1}_1\frac{1}{x} dx \leq 1 + 1/2 + \cdots + 1/n$. - Mathematics Stack Exchange
![Page:Russell, Whitehead - Principia Mathematica, vol. I, 1910.djvu/132 - Wikisource, the free online library Page:Russell, Whitehead - Principia Mathematica, vol. I, 1910.djvu/132 - Wikisource, the free online library](https://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Russell%2C_Whitehead_-_Principia_Mathematica%2C_vol._I%2C_1910.djvu/page132-1024px-Russell%2C_Whitehead_-_Principia_Mathematica%2C_vol._I%2C_1910.djvu.jpg)
Page:Russell, Whitehead - Principia Mathematica, vol. I, 1910.djvu/132 - Wikisource, the free online library
![math mode - Typesetting famous 54.43 proof (1+1=2) in Principia Mathematica - TeX - LaTeX Stack Exchange math mode - Typesetting famous 54.43 proof (1+1=2) in Principia Mathematica - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/KBNK5.png)
math mode - Typesetting famous 54.43 proof (1+1=2) in Principia Mathematica - TeX - LaTeX Stack Exchange
![math mode - Typesetting famous 54.43 proof (1+1=2) in Principia Mathematica - TeX - LaTeX Stack Exchange math mode - Typesetting famous 54.43 proof (1+1=2) in Principia Mathematica - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/KlRJR.png)