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In this question I wrote

$$|\mathbf{k_{scat}}| = \frac{2 \pi}{h} \sqrt{2 m_e e V}$$

where $h$ is the Planck constant.

In physics we have h-bar which is $h/ 2 \pi$ but I don't know how to add h-bar using MathJax.

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    $\begingroup$ \hbar should produce $\hbar$. $\endgroup$ – Ivo Terek Apr 23 at 23:42
  • $\begingroup$ @IvoTerek indeed it should, and does! I wonder if that could be added to MathJax basic tutorial and quick reference page somehow? $\endgroup$ – uhoh Apr 23 at 23:45
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    $\begingroup$ I just checked it quickly and it doesn't seem that this would fit with any of the current answers (and it doesn't warrant a new answer by itself). However, one of the answers does mention the Detexify website, where you can draw a symbol and they recognize what it is to give you the code. There is also a mobile app. I just made a sloppy h-bar on the mobile app and it was easily recognized. $\endgroup$ – Ivo Terek Apr 23 at 23:48
  • $\begingroup$ @IvoTerek yay! i.stack.imgur.com/peJsY.png $\endgroup$ – uhoh Apr 23 at 23:51
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\hbar produces $\hbar$ (as @IvoTerek has mentioned) and \hslash produces $\hslash$.

Generally, you could refer to MathJax's docs for LaTeX commands/symbols supported by MathJax and page 20-22 of amsfonts' user guide for a list of symbols with their corresponding commands.

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