Mr.Tang's Blog
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How to Use Latex to Write Your Blog

Posted on In Disqus:

To write math equations in my blog pages, I use Latex. Latex is a document preparation system which allows you to write professional-looking technical documents. For example, most of the scientific publications are written with Latex.

The line above is created by adding a code block below in my markdown file (source files of blog pages):

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$$
Hello, \LaTeX\ world.
$$

Dependencies

You need to install some dependencies to make your hexo project be able to render “LaTex code” correctly in markdown files. For the NexT theme (the theme I use), you can easily find the “math” block and update it to to below:

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math:
  enable: true
  # Default(true) will load mathjax/katex script on demand
  # That is it only render those page who has 'mathjax: true' in Front Matter.
  # If you set it to false, it will load mathjax/katex srcipt EVERY PAGE.
  per_page: false
  engine: mathjax

Besides, you need to make sure you have installed hexo-renderer-kramed:

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npm install hexo-renderer-kramed --save

Syntax

Here I list some basic syntax rules, you can find the full document in LaTex Wikibooks.

Escaping block

There are two ways to include $\LaTeX$ code in markdown:

  1. use $<latex expression>$ to insert $inline$ expression;
  2. use $$<latex expression>$$ to insert displayed expression:

Alignment

You can use & to align different lines, and \\ to add a line break.

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\begin {aligned} 
A&=B \\
&=C \\
&=D 
\end {aligned}

The rendered result is (note that I dismissed $$):

Examples

Here are some math equations that we often use.

Case block

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sign(x)=
\begin {cases} 
+1, & x\geq0 \\
-1, & x<0 
\end {cases}

Fraction

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\frac{1}{1+e^{-x}}\\

\begin{aligned}
  x_0+\frac{1}{x_1+\frac{1}{x_2+\frac{1}{x_3+\frac{1}{x_4}}}}
\end{aligned}

Matrix

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\begin{bmatrix} a & b \\ c & c \end{bmatrix}
\begin{vmatrix} x & y \\ z & v \end{vmatrix}
\begin{Bmatrix} x & y \\ z & v \end{Bmatrix}
\begin{pmatrix} x & y \\ z & v \end{pmatrix}
\begin{bmatrix} 0 & \cdots & 0 \\ \vdots & \ddots & \vdots \\ 0 & \cdots & 0 \end{bmatrix}