Markdown tool memo

Edit Latex online tool

• Online tool 1: The
  interface is refreshing and easy to use: http://www.wiris.com/editor/demo/en/developers
• Online tool 2: The
  interface is simple, there are many ready-made mathematical formulas, but there is a small shortcoming, the interface is always jittery and uncomfortable. .
  https://latex.91maths.com/
• Online tool 3:
  Super simple interface, that is, the font is a little bit small
  https://codecogs.com/latex/eqneditor.php

The following characters cannot be typed directly in latex

 $  #  %  &  ~  _  ^  \  {
    
      }

To represent these characters in a mathematical environment, you need to add "\" before the character. For example: \ # \ $.

Flowchart tool mermaid

https://mermaid-js.github.io/mermaid/#/flowchart?id=graph After
mermaid edits the flowchart under the window, the long character count will overflow the chart, but it will not under the ubuntu browser. So after editing, republishing under ubuntu will have good results. (It seems that the official has solved this problem recently.)