# Markdown examples(reprinted)

## $\KaTeX$

$\KaTeX$ is a fast and easy-to-use library that enables the rendering of mathematical notation, using LaTeX syntax.

You can use $\KaTeX$ **inline** by wrapping the expression between `$`

or between `\\(`

and `\\)`

.

For example, `$ \sin(x) = \sum_{n=0}^{\infty} \frac{(-1)^n}{(2n + 1)!} x^{2n + 1} $`

would render: $ \sin(x) = \sum_{n=0}^{\infty} \frac{(-1)^n}{(2n + 1)!} x^{2n + 1} $

To display the expression **on its own line and centered**, wrap it around `$$`

or between `\\[`

and `\\]`

.

For example, `\\[ r = \frac{\sum_{i=1}^{n}(x_i - \bar{x})(y_i - \bar{y})}{\sqrt{\sum_{i=1}^{n}(x_i - \bar{x})^2}\sqrt{\sum_{i=1}^{n}(y_i - \bar{y})^2}} \\]`

renders: \[ r = \frac{\sum_{i=1}^{n}(x_i - \bar{x})(y_i - \bar{y})}{\sqrt{\sum_{i=1}^{n}(x_i - \bar{x})^2}\sqrt{\sum_{i=1}^{n}(y_i - \bar{y})^2}} \]

To activate $\KaTeX$ for a post or an entire section, include `katex = true`

within the `[extra]`

section of the front matter. For exemple:

```
= "Testing KaTeX"
= 2002-11-30
[]
= true
```

You may enable it globally as well, by setting `katex = true`

in the `[extra]`

section of your `config.toml`

.

For enhanced performance and security, the $\KaTeX$ JavaScript, CSS, and fonts are hosted locally.

**Note**: After enabling $\KaTeX$, if you want to use $ without rendering a mathematical expression, escape it with a single backslash: `\$`

.

## Table

Here’s an example of a table^{[1]}. Its colours change depending on the current theme.

Symbol | Element | Atomic Number |
---|---|---|

H | Hydrogen | 1 |

C | Carbon | 6 |

Fe | Iron | 26 |

Au | Gold | 79 |

## Code Block

```
```

## Code tags

In Rust, you declare a mutable variable with `let mut x = 5;`

, whereas in Python, you simply use `x = 5`

. Similarly, to print a value in Rust, you would use `println!("Value: {}", x);`

, but in Python, it’s as straightforward as `print(f"Value: {x}")`

.

## Quote

“We’re all hurtling towards death. Yet here we are, for the moment, alive. Each of us knowing we’re going to die. Each of us secretly believing we won’t.”

— Charlie Kaufman, Synecdoche, New York

And here’s an example of a footnote! ↩