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I'm currently trying to write over/under an implies arrow in LaTeX (in math mode):

\implies_{text} 

This places the text lower, but next to the arrow, not below it. How can I get it below the arrow?

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Related question: tex.stackexchange.com/questions/4813/extendible-equals-sign if you're willing to load amsmath then I strongly expect that the answer to your question will be very similar to the accepted answer to that question. –  Loop Space Nov 9 '10 at 19:21
    
Already running amsmath, sorry. –  Femaref Nov 9 '10 at 19:25
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That you are already running amsmath is a good thing, not a bad one! –  Loop Space Nov 9 '10 at 19:45
    
the "sorry" wasn't for running amsmath, but not providing the detail in the question ;) –  Femaref Nov 9 '10 at 20:04

1 Answer 1

up vote 15 down vote accepted

You can use \xRightarrow[below]{above} from the mathtools (or extpfeil) package or \xLongrightarrow[below]{above} from extarrows. (Have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol.)

If you want to keep the the same arrow length as implies, you can use \underset and \overset from amsmath, e.g. \underset{below}{\implies}, or maybe \underset{\mathclap{below}}{\implies} (\mathclap makes it so that “below” doesn’t introduce extra vertical space if it is longer than the arrow. It is included in the immensely useful mathtools package).

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Sadly, the proposed arrow looks different than the implies arrow, so it wouldn't fit with the rest of the equations :/ thanks for your help though. –  Femaref Nov 9 '10 at 19:35
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@femaref Except for the length they look exactly the same on my system. Do you want the length to stay constant? –  Caramdir Nov 9 '10 at 19:39
    
the second thing helped me. For you, comparision of the two arrows: abload.de/img/arrows_zoomednbxj.png and abload.de/img/arrowsrbfs.png –  Femaref Nov 9 '10 at 19:49
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\underset FTW. And I need to learn more about mathtools. –  Matthew Leingang Nov 9 '10 at 19:56
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@Femaref: You are using 12pt, aren't you? You might want to have a look at this question if you want the arrows look better. –  Hendrik Vogt Nov 9 '10 at 21:33

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