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I use the command \underset to write a symbol or word below of a symbol. For instance, $\underset{\mbox{iso}}{\cong}$, but the distance between them looks too big. How can I minimize that?

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    Welcome to TeX.SX! Please help us help you and add a minimal working example (MWE) that illustrates your problem. Reproducing the problem and finding out what the issue is will be much easier when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – Skillmon Mar 29 '18 at 10:21
  • @Skillmon : thank you very much! And I will write the next question with the appropiate beginning and the end (I am sorry for this case). – joseabp91 Mar 29 '18 at 10:28
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You can reduce the height of the \hbox{iso} to 0pt via \smash:

\documentclass[border=2mm]{standalone}

\usepackage{mathtools}

\begin{document}
$\underset{\smash{\hbox{iso}}}{\cong}$
\end{document}

enter image description here

  • @joseabp91 perhaps you shouldn't accept my answer right now. There is a good chance that in the next few hours there will be a better answer. If that's not the case you can accept mine. – Skillmon Mar 29 '18 at 10:47
  • I have accepted it as I have found the thing which I was searching in your answer – joseabp91 Mar 29 '18 at 10:52

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