This site is here to facilitate *mathematical* and *computational* discussion. As such, it is often nice to format your questions and responses as nicely as possible - including typeset mathematics, images, and code as appropriate.

## Markdown

Textual entry into discourse is based on Markdown - a lightweight markup language that makes formatting relatively easy. I should mention that Markdown is also used in the Jupyter notebook. To start this particular section, for example, I simply entered:

```
## Markdown
```

## Code

Sometimes, we’d like to enter computer code - like I just did above to indicate how to start a section. To do so, just indent your line four spaces.

There many other things you can do with Markdown. If you’re interested in more, you can check out this MarkDown Cheasheet.

## Typeset math

The forum uses a Javascript library called MathJax to render snippets of LaTeX markup as mathematical formulae. For example, to type the following:

If f(x) = e^{-x^2},

then

I would type in

```
If $f(x) = e^{-x^2}$, then
$$
\int_{-\infty}^{\infty} f(x) \, dx = \sqrt{\pi}.
$$
```

Note that the inline mathematics is enclosed in single dollar sings `$like this$`

while larger display style math is enclosed in double dollar signs with line breaks

```
$$
like this
$$
```

While it seems a bit strange, it’s not so hard after a little practice.

## Images

When you’re editing a post, you’ll notice a toolbar with an image uploader, as I’ve circled here:

![discourse_editor|690x288](upload://x8bcLltUJJcR2zn6UjU4RpSahw4.png

Of course, I used exactly that to upload that very image!

## Desmos

The “share” button on Desmos includes an “embed” button that generates a funny bit of HTML called an `iframe`

. You can plug that right into the forum to get something like so: