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From: Ulrike Fischer <news3@nililand.de>
Newsgroups: fr.comp.text.tex
Subject: Re: \bar et amsmath
Date: Thu, 22 Sep 2022 09:26:54 +0200
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Am Wed, 21 Sep 2022 11:17:34 +0200 schrieb news.free.fr:

> Bonjour,
> 
> Voici le code qui fonctionne
> 
> \documentclass{article}
> \begin{document}
> \[
>    \bar{\bigcap_{\tilde{j}\in\tilde{\mathcal{T}}^{w} }}
> \]
> \end{document}
> 
> mais avec amsmath ça râle
> 
> \documentclass{article}
> \usepackage{amsmath}
> \begin{document}
> \[
>    \bar{\bigcap_{\tilde{j}\in\tilde{\mathcal{T}}^{w} }}
> \]
> \end{document}
> 

\documentclass{article}
\usepackage{amsmath}
\newsavebox{\accentbox}
\newcommand{\compositeaccents}[2]{%
  \sbox\accentbox{$#2$}#1{\usebox\accentbox}}
\begin{document}
\[
   \compositeaccents{\bar}{\displaystyle
\bigcap_{\tilde{j}\in\tilde{\mathcal{T}}^{w}}}
\]
\end{document}


de

https://tex.stackexchange.com/a/30328/2388

qui contient aussi une explication.

-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/