The ostensible way to include math symbols is to use the push button with the pi raised to the Sigma and select the appropriate one--in this case the integral sign. I'll try that here: . It looks fine in the text box as I'm writing, but it will probably be lost upon posting.
Another way is to click on the View Source box to the lower right of the text box in which you type. Then use ampersand int semicolon:
re: No Subject
