Vladimir wrote:

> ) It would help if there would be a single page/cheat sheet of how to write formulas/charts and embed images into the posting (may be is there, but I just did not find it).) I tend to click on the gear-button to view other people's source and copy what I can,but that does not seem to work for many things.

I urge all you students to start creating such a cheat sheet. Add material to [[Forum - Guide]]! We've got 200 people here, including at least 100 computer scientists and programmers, so it should be quick work. I'll just give a few high-level hints.

**Writing math**

The Azimuth Forum uses [MathJax](https://docs.mathjax.org/en/latest/start.html#) to display equations. MathJaX is a version of LaTeX designed for use on the web, limited in its power compared to full LaTeX. If you don't know LaTeX, you can't do math in the 21st century! No other method is as good at creating equations such as this one from the book:

$$ d(U,V) :=\sup_{u\in U}\inf_{v\in V}d(u,v)
\qquad\qquad
\mathcal{X}(U,V) :=\bigwedge_{u\in U}\bigvee_{v\in V}\mathcal{X}(u,v). $$

It takes a while to learn LaTeX: everyone serious about math must go through the pain of this. Here is a quick intro:

* [MathJax basic tutorial](https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference).

Unfortunately, a couple things on this tutorial don't apply here! Most importantly, as I mentioned on the welcome page:

For "displayed" equations, centered on the page, use double dollar signs: `$$E = \sqrt{m^2 + p^2}$$` produces this: $$E = \sqrt{m^2 + p^2}$$

For "inline" equations, mixed in with your text, use this method: `\\(E = \sqrt{m^2 + p^2}\\)` produces this: \\(E = \sqrt{m^2 + p^2}\\).

**Formatting**

Unlike full-fledged LaTeX, MathJaX does not handle formatting _outside_ equations. The Azimuth Forum runs on [Vanilla](https://vanillaforums.com/en/features/forums/), but not all the fancy features of Vanilla have been activated here.

To create italics, boldface, quoted passages numbered or itemized lists, subject headers, and the like, use [Markdown](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet). To include images you can also use HTML: for example,

``

creates this:



This image is stored in my own personal website. If someone wants to create a Github site or other method for storing images to be used in this course, please go ahead and let us know about it!

**Questions**

If you don't know how to do something, and someone else does, the quickest solution is often to click on the little gear at upper right of each comment, and choose "View Source". Then you can see how they did it.

Every imaginable question about LaTeX has already been asked and answered here:

* [TeX - LaTeX Stack Exchange](https://tex.stackexchange.com/).

If you have specific technical questions about MathJax or Vanilla or Markdown, or other aspects of how the Azimuth Forum works, start a discussion in category [Technical](https://forum.azimuthproject.org/categories/Technical). Since we have a lot of experts on computer science here, someone here can probably answer your question.

[[Dave Tanzer]] set up the forum, and he's paying for it. But he doesn't have much time to manage it, or answer questions - nor do I. So please restrain your desire to perfect the environment and focus on learning math. If one of you wants to help run the forum, and has time to do it in a consistent way throughout the course, please volunteer!