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I want to subscript a "+" or "-" sign. But it not working with this:

$$(\beta-\gamma)_{+}$$

It has not any error, But plus sign seeing inline instead of subscript. any Idea?

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    assuming that is in math mode (which you need already for \beta )that will work. What error do you get?
    – David Carlisle
    Commented Nov 2, 2016 at 7:50
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    Please always post complete documents that allow people to reproduce the error and give exact error messages from the log. "not working" is not a useful description of the problem.
    – David Carlisle
    Commented Nov 2, 2016 at 7:51
  • @DavidCarlisle I posted a edit.
    – SirSaleh
    Commented Nov 2, 2016 at 8:27
  • Your edit does not help at all, you still haven't posted a document that would allow anyone to reproduce the problem, not have you said what error message you got. Also Answers should go in answer postings not by editing the question
    – David Carlisle
    Commented Nov 2, 2016 at 8:48

2 Answers 2

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Are you looking for this.. 

\documentclass{article}
\usepackage{amsmath,amssymb}

\begin{document}
$\beta_{-}  \gamma_{+}$

\end{document}

enter image description here

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    No Idea why. but after adding two empty $ $ sign after this expression this works :|
    – SirSaleh
    Commented Nov 2, 2016 at 8:20
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I don't know why, but after I added two dollar sign with just a space between that, the problem solved. and plus sign became subscript. This is what I did:

$$(\beta-\gamma)_{+}$$
$ $
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