Math stuff in comments
I have a blog hosted for free at wordpress.com. It allows Latex notation to display math formulas in posts and comments. Here is an example.
Wordpress.com has Latex installed, but my host, Bluehost, does not. One solution seems to be to use mimetex, as explained here, here, and here. I will try to install it soon and tell you when it is done.
Meanwhile, here and here are online Latex editors. They let you create formulas and download them as images.
For math symbols, like the one for infinity, you may use these codes.
Come to think of it, it would be nice to be able to preview comments before they are posted. At the moment you can’t.
One last thing. Google has made public an api for generating charts or graphs in real time online.
Here is a comprehensive overview of other ways of getting charts online.
So many things, so little time… 