等價關係

 等價關係

https://zh.wikipedia.org/wiki/%E7%AD%89%E4%BB%B7%E5%85%B3%E7%B3%BB#%E4%B8%8D%E6%98%AF%E7%AD%89%E4%BB%B7%E5%85%B3%E7%B3%BB%E7%9A%84%E5%85%B3%E7%B3%BB%E7%9A%84%E4%BE%8B%E5%AD%90

 

vim font size

 https://vim.fandom.com/wiki/Change_font

Latex

 ShareLatex (on line)

https://www.sharelatex.com/

The Not So Short Introduction to LATEX 2ε 

http://tug.ctan.org/info/lshort/english/lshort.pdf