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I want to add something like FA (the force at point A.), I've been doing it this way:
$F$<sub>$A$</sub> but inside an equation starting with 2 dollar signs(I want it to be written on a separate line Like:
$$F&lt;sub>A&lt;/sub>$$ this is causing some troubles, and it seems that it couldn't be done this way, so how can I do it?

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    $\begingroup$ There is a pretty good quick reference that covers a lot more than this at meta.math.stackexchange.com/q/5020 $\endgroup$ Jan 14 '14 at 18:22
  • $\begingroup$ Possible duplicate: meta.physics.stackexchange.com/q/804/2451 $\endgroup$
    – Qmechanic Mod
    Jan 14 '14 at 19:39
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    $\begingroup$ In general, if you want to know how something like this is done, find a question or answer that does it, and click "edit". Then you will see the source code for the equations. $\endgroup$
    – Nathaniel
    Jan 17 '14 at 8:51
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Underscore. F_A in TeX is $F_A$. For longer strings use {} groups like F_{10}: $F_{10}$

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The tool we use for math rendering is called MathJax. It provides a close simulation of LaTeX math-mode. The subscript operator is _, so you write F_A.

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