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I was wondering whether it is possible to add some comment on top of the \approx symbol in a similar way that the command \xrightarrow{text} produces an arrow with text over it.

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marked as duplicate by mafp, lockstep, Claudio Fiandrino, Werner, Martin Schröder Mar 15 '13 at 15:50

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

See also tex.stackexchange.com/q/74125/15925 – Andrew Swann Mar 15 '13 at 10:42
up vote 14 down vote accepted

You can use the \stackrel{}{} for this:

        A \stackrel{\text{text}}{\approx} B
        A \approxtext{test} B

Or a small wrapper: \newcommand{\approxtext}[1]{\ensuremath{\stackrel{\text{#1}}{\approx}}}. Result:

enter image description here

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The text above the symbol should probably treated as text, not as math. What's the purpose of the additional braces? – egreg Mar 15 '13 at 10:33
Thanks for such a detailed explanation However, I don't see the difference between the different approaches? I found that I can also accommodate math in the text above by the usual prescription $mathtext$ – pablo Mar 15 '13 at 10:54

You can use \stackrel{a=b}{\approx} or if it is real text \stackrel{\text{your text}}{\approx} if your text is not too long. The \approx symbol is rather small, so I wouldn't add too much on top to keep your equations readable.

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That's working perfect! Thanks for the quickness! Just to know, which package does it comes from this? ams math? – pablo Mar 15 '13 at 10:53
@pablo: Actually, you don't even need amsmath for this. But amsmath has two more commands: \overset and \underset. The former does basically the same as \stackrel – Anke Mar 15 '13 at 11:13
What is the text is long? What command is to be used then? – Jason Nov 27 '15 at 18:56

As already mentioned \stackrel can be used for it. I'd just recommend adding \scriptscriptstyle or, say, \tiny if it is just text, plus \smash. Otherwise one often ends up having a combined symbol that mess with the line spacing if used in the text.


Small size to reduce the height
\smash to remove the height completely (the small size then help us not to overlap too much with the line above)

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