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### FAQ for Physics Stack Exchange

Frequently Asked Questions This thread is an index of Frequently Asked Questions, and other resources, for Physics Stack Exchange. General questions about Stack Exchange For general questions about ...
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### How to write mathematical expressions in questions using android devices? [duplicate]

I posted a question at Physics Stack Exchange site, and I uploaded a photograph of the calculation I had done on that. But, I was asked to write all my calculations in the question(and not in the ...
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### What is the best/easiest way to write math symbols on this site? [duplicate]

For those with an Android phone, what is your favorite app, or whatever, for displaying math symbols on this site?
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### Special text codes for generating symbols [duplicate]

What are special text codes that must be written to generate various mathematical formulae, symbols like limit, derivative, integral, closed integral etc. (in simple keypad) For instance, "**" for ...
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### Posting questions with math symbols

I did a search and came up empty on how to use mathjax on this site. Do I need to use a third party or is a math symbols program built into the physics site?
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### What is the Latex and MathJax, how can I write beautiful formulas in my posts?

I get regularly the feedback in comments to use Latex or MathJax. Also I would write beautiful formulas what I can do only on pen & paper. Where can I get info about these?
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### How can I type math? [duplicate]

I don't know how I can type math in physics.stackexchange when I ask a question or answer. I type math in the Office word and use print screen. May anyone help me?
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### MathJax: How do I write matrices on the same line?

In answering this question, I needed to multiply three matrices - which obviously involves writing them on the same line. I tried a couple of things, none of which worked, so my question is - how do ...
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### How to use Mathjax? [duplicate]

I can't seem to find instruction anywhere on how to use Mathjax or whatever it is called to correctly format equations etc. I remember seeing a list but can't locate it on the site
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### How to add a subscript character inside an equation

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 ...
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How do I write fractions in my answers and questions? How do I write any mathematical expression ? I have tried using x/y type of expressions but it does not work. Please tell me how to do it. Will ...
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### How to input using Latex? [duplicate]

I just found this site today and I asked a few questions but I didn't know how to use the latex syntax, so my questions were difficult to understand. Can anyone tell me how to use this Latex program? ...
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### What notation and symbols are commonly used here?

I just noticed that we have a new section on our FAQ about notation and symbols. What should go in this section? Obviously we can't explain all the mathematical notation that physics uses, but are ...
I'm trying to understand the answers given to the question: How long it will take for a tree to fall on a ground? For example how are the following to be interpreted \$ \ { } and what are: frac ...