Intro, and help on syntax for posting equations

Hi, I'm a Canadian student of physics currently studying in Oxford, UK.

I'd like to ask for some help on a problem of mine and it would help to know the syntax for posting equations. If I wanted to post something like "y = (sum over i from 0 to n) (x sub i)" how would I type this in to get a nice looking equation? Is there a resource somewhere that goes over such useful syntax?

Re: Intro, and help on syntax for posting equations

Yes, we use the inbuilt LaTeX compiler on this site. There's more info in the LaTeX help sub-forum on this site. You need "tex tags", which is tex and /tex in square brackets. Then inside the tags, write y = \sum_{i = 0}^n{x_i} and you will get