# a post with math

This theme supports rendering beautiful math in inline and display modes using MathJax 3 engine. You just need to surround your math expression with `$$`

, like `$$ E = mc^2 $$`

. If you leave it inside a paragraph, it will produce an inline expression, just like \(E = mc^2\).

To use display mode, again surround your expression with `$$`

and place it as a separate paragraph. Here is an example:

You can also use `\begin{equation}...\end{equation}`

instead of `$$`

for display mode math. MathJax will automatically number equations:

\begin{equation} \label{eq:cauchy-schwarz} \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) \end{equation}

and by adding `\label{...}`

inside the equation environment, we can now refer to the equation using `\eqref`

.

Note that MathJax 3 is a major re-write of MathJax that brought a significant improvement to the loading and rendering speed, which is now on par with KaTeX.