I clicked on "add comment" and pasted the latex code, but looking at it in the email below, it removed all the "\" from the code I pasted in the comment window. So all the latex commands below do not have the "\".
I see the backslashes at https://puszcza.gnu.org.ua/bugs/?224. And when I submitted a test comment there, the \ was in the email I got, too. Just maybe it's a bug in your mail reader? Seems very unlikely, but I can't think of another explanation. k