26

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?

4
  • 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. Nov 9, 2010 at 19:21
  • Already running amsmath, sorry.
    – Femaref
    Nov 9, 2010 at 19:25
  • 2
    That you are already running amsmath is a good thing, not a bad one! Nov 9, 2010 at 19:45
  • the "sorry" wasn't for running amsmath, but not providing the detail in the question ;)
    – Femaref
    Nov 9, 2010 at 20:04

1 Answer 1

31

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).

6
  • 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, 2010 at 19:35
  • 1
    @femaref Except for the length they look exactly the same on my system. Do you want the length to stay constant?
    – Caramdir
    Nov 9, 2010 at 19:39
  • 1
    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, 2010 at 19:49
  • 1
    \underset FTW. And I need to learn more about mathtools. Nov 9, 2010 at 19:56
  • 1
    @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. Nov 9, 2010 at 21:33

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.