# How to use this blog

If you have been added as an “author”, you can add new posts or comment on existing ones. If you are taking or auditing the class – in SF, Berkeley, Colombia, or elsewhere – you should have received an invitation. Anyone can write comments on the posts.

You can type mathematical equations using LaTeX – just write “latex” after the first $sign. For example, to type $\sum_{k=0}^n {n \choose k} = 2^n$ you just need to write$ latex \sum_{k=0}^n {n \choose k} = 2^n$(removing the space between$ and latex)

If you don’t know LaTeX, you should learn it. It is the one and only typesetting language that professional mathematicians use. You can see my favorite quick introduction to LaTeX by clicking here. You can see other useful tips on using LaTeX on wordpress blogs here.

(Let me know if you are not an author and would like to be added. If I don’t know you personally, please email me (find my email address on google) and tell me about your math background and whether you plan to follow the course – the lecture videos and notes are on my website. You are welcome to participate, I just want to avoid internet robots.)