In our blog, you can use TeX (on any page, post, or comment) by including the codeword *latexpage* in square bracket somewhere near the top. Then use regular TeX code. Our blog has installed a “plug-in” called QuickLaTex to make it all work. Try it!!

Here is a link to a pdf of TeX code (Samantha Youmans told Math Seminar about it):

http://amath.colorado.edu/documentation/LaTeX/Symbols.pdf

An in-line example will look like . Or you can have it displayed in its own line:

I thought I would try to use TeX in a comment, just to see if it works:

if then we get

Why not show a summation .