Help me understand what mathjax is

I keep seeing people talk about mathjax on other posts by moderators etc. and it won't let me post/comment on there to ask what it is due to being new and not having enough reputation. So......what is mathjax?

• This belongs on meta.math.stackexchange Commented Oct 9, 2017 at 3:50
• MathJax is the software by which one can write things like $$\int_0^1 \frac{dx}{x(1-x)} = \infty,$$ coded as \int_0^1 \frac{dx}{x(1-x)} = \infty . Commented Oct 9, 2017 at 4:12
• @RossMillikan I couldn't post on there because I am new. Sorry for the inconvenice. I see it got migrated over anyway. Commented Oct 9, 2017 at 6:07
• en.wikipedia.org/wiki/MathJax
– JRN
Commented Oct 9, 2017 at 6:22
• For some basic information about writing math at this site see e.g. basic help on mathjax notation, mathjax tutorial and quick reference, main meta site math tutorial and equation editing how-to. Commented Oct 9, 2017 at 10:51
• Perhaps the links in the tag-info and the Wikipedia link (already posted by Joel) might give you the basic idea. Commented Oct 9, 2017 at 16:15

It is a way to format mathematical things nicely. It is similar to $\LaTeX$ - I do not understand the differences. You enclose things in dollar signs and they look nice. For example if you want the stacked fraction 1/2 you write \frac 12 and put it in dollar signs to get $\frac 12$ You can right click on any MathJax on the site and select Show Math As -> TeX Commands to see how it was done. That is how I learned the basics. Web searching covered the finer points.
Mathjax is what we use on math.stackexchange.com to format mathematical formulas in a nice and easily-readable way. It is basically LaTeX syntax, with a few minor exceptions. For example, \$x\$ renders as $x$, \$f(x)>15x^2\$ as $f(x)>15x^2$.