I've noticed that different users have written LaTex code using either commands inside two $ signs or simply connected a single term to a & symbol. How many different ways are there of coding math symbols on stack exchange?
EDIT: I didn't mean for this to repeat what was said in the tutorial. I specifically asked it because I couldn't find this info in the tutorial. I meant to say "how many ways are there to write the same thing?" For instance, I noticed someone did a pi symbol (or something like it) using &pi or some other code. Is this another markup language? How come there is no reference to it in the tutorial? How many different ways are there to write each expression other than with standard Mathjax?