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What are the markups for such symbols?

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    $\begingroup$ \geqslant (and ¸leqslant) for $\geqslant$ (and $\leqslant$). See this post for general information about MathJax commands. $\endgroup$ – Daniel Fischer♦ Nov 1 '15 at 16:25
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    $\begingroup$ or just \ge for $\ge$ and \le for $\le$ $\endgroup$ – mrf Nov 1 '15 at 16:40
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You can use $\ge$ or $\geq$ (to get $\geq$) or for a variant $\geqslant$ (to get $\geqslant$).

For less than or equal to replace the "g" by "l".

For the strict versions, $\gt$ and $\lt$, you can use $\gt$ and $\lt$, or just the symbols $>$ and $<$. 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

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    $\begingroup$ 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 $a&lt;b$ which doesn't render: $a&lt;b$. This isn't a reason to avoid strict inequality signs in titles as much as a reason to finally fix this over-escaping bug... $\endgroup$ – user147263 Nov 1 '15 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♦ Nov 1 '15 at 18:38
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    $\begingroup$ That also happens, when new users post things like a<b therefore -b>-a without dollar signs: this renders as a-a on the site. Some such questions get closed as unclear, unless someone realizes what is going on and edits. $\endgroup$ – user147263 Nov 1 '15 at 18:41

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