Introduction à Markdown

# This is an <h1> tag
## This is an <h2> tag
###### This is an <h6> tag

*This text will be italic*
_This will also be italic_

**This text will be bold**
__This will also be bold__

_You **can** combine them_

* Item 1
* Item 2
  * Item 2a
  * Item 2b

1. Item 1
1. Item 2
1. Item 3
   1. Item 3a
   1. Item 3b

![GitHub Logo](/images/logo.png)
Format: ![Alt Text](url)

http://github.com - automatic!
[GitHub](http://github.com)

As Kanye West said:

> We're living the future so
> the present is our past.

I think you should use an
`<addr>` element here instead.

Equations can be formatted inline or as displayed formulas. In the latter case, they are centered and set off from the main text. In the former case, the mathematical material occurs smoothly in the line of text.

In order to fit neatly in a line, summation expressions (and similar constructs) are formatted slightly differently in their inline and display versions.

Inline mathematical material is set off by the use of single dollar-sign characters. Consequently, if you wish to use a dollar sign (for example, to indicate currency), you need to preface it with a back-slash. The following examples, followed by their typeset versions, should make this clear

This summation expression $\sum_{i=1}^n X_i$ appears inline.

This summation expression \(\sum_{i=1}^n X_i\) appears inline.

This summation expression is in display form.

$$\sum_{i=1}^n X_i$$

This summation expression is in display form.

\[\sum_{i=1}^n X_i\]