Motivation:
Every once in a while, I find myself making edits like this one, where OP (likely due to inexperience in asking questions) has used display math mode ($$
delimiters) and/or the \displaystyle
or \dfrac
commands in ways discouraged by the community.
This issue has been around for a while, see e.g. this meta question.
In line with the more-or-less universally supported initiative to be more communicative to especially new users, I have been making remarks similar to the one I just added to the comment templates thread, giving a short explanation of why not to use these functionalities of MathJax in titles.
Question:
In an attempt to make this all more accessible to new users without them having to commit one of these mistakes, this question intends to gather all guidelines on the use of $\rm\LaTeX$ in question titles in one place, the CW answer to this question.
\left\right
uses completely. One should use it with care, though. The problems occur when people write complex three-deck fractions, and it gets when when they use\dfrac
in all of them! $\endgroup$ – Asaf Karagila♦ May 23 '13 at 17:21\displaystyle
looks like on the front page would aid in understanding what the issue is. I have never seen a\displaystyle
title, so I have no idea how bad it is. $\endgroup$ – Calculemus May 25 '19 at 14:20