What are the markups for such symbols?
You can use
$\geq$ (to get $\geq$) or for a variant
(to get $\geqslant$).
For less than or equal to replace the "g" by "l".
For the strict versions, $\gt$ and $\lt$, you can use
or just the symbols
$<$. The symbols did sometimes create issues but I think this is fixed by now.
For a general guide see MathJax basic tutorial and quick reference
2$\begingroup$ Not completely fixed, unfortunately. When
$a<b$is in a title, and another question is closed as a duplicate of it, the automatic comment has
$a<b$which doesn't render: $a<b$. This isn't a reason to avoid strict inequality signs in titles as much as a reason to finally fix this over-escaping bug... $\endgroup$– user147263Nov 1, 2015 at 18:33
$\begingroup$ Thanks, I was not aware of this. What I thought of was an issue that the post got completely cut off as something got misinterpreted. $\endgroup$– quid ModNov 1, 2015 at 18:38
4$\begingroup$ That also happens, when new users post things like
a<b therefore -b>-awithout dollar signs: this renders as
a-aon the site. Some such questions get closed as unclear, unless someone realizes what is going on and edits. $\endgroup$– user147263Nov 1, 2015 at 18:41
¸leqslant) for $\geqslant$ (and $\leqslant$). See this post for general information about MathJax commands. $\endgroup$
\gefor $\ge$ and
\lefor $\le$ $\endgroup$