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How to use MathJax & UML

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You can create various types of charts and mathematical expressions on HackMD. Refer to the example below.

MathJax

You can render LaTeX mathematical expressions using MathJax, as on math.stackexchange.com, except the space after the start $ and the space before the end $ are not allowed in the inline math:

The Gamma function satisfying

$\mathrm{\Gamma }(n)=(n-1)!\mathrm{\forall }n\in \mathbb{N}$ is via the Euler integral

$$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}.$$

$$\mathrm{\Gamma }(z)={\int }_0^{\mathrm{\infty }}{t}^{z-1}{e}^{-t}dt.$$

More information about LaTeX mathematical expressions.

Click here :point_left:.

Mind map

UML Diagrams

Sequence Diagrams

You can render sequence diagrams like this:

Graphviz

Learn more about 'Graphviz'

Abc

More information about sequence diagrams syntax here.
More information about flow charts syntax here.
More information about graphviz syntax here
More information about mermaid syntax here
More information about abc syntax here