28 lines
1.3 KiB
Markdown
28 lines
1.3 KiB
Markdown
---
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layout: post
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title: a post with math
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date: 2015-10-20 11:12:00-0400
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description: an example of a blog post with some math
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tags: formatting math
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categories: sample-posts
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---
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This theme supports rendering beautiful math in inline and display modes using [MathJax 3](https://www.mathjax.org/) 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 $$.
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To use display mode, again surround your expression with `$$` and place it as a separate paragraph. Here is an example:
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$$
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\sum_{k=1}^\infty |\langle x, e_k \rangle|^2 \leq \|x\|^2
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$$
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You can also use `\begin{equation}...\end{equation}` instead of `$$` for display mode math.
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MathJax will automatically number equations:
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\begin{equation}
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\label{eq:cauchy-schwarz}
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\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)
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\end{equation}
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and by adding `\label{...}` inside the equation environment, we can now refer to the equation using `\eqref`.
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Note that MathJax 3 is [a major re-write of MathJax](https://docs.mathjax.org/en/latest/upgrading/whats-new-3.0.html) that brought a significant improvement to the loading and rendering speed, which is now [on par with KaTeX](http://www.intmath.com/cg5/katex-mathjax-comparison.php).
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