Comment définir une colonne en mode mathématique dans un tableau ?#

De la même façon qu’à la question « Comment changer la fonte d’une colonne ? », vous pouvez utiliser les « descripteurs » de colonnes > et <. En voici un exemple.

Exemple compilable et éditable
\documentclass[french]{article}
  \usepackage[T1]{fontenc}    % Encodage T1 (adapté au français)
  \usepackage{lmodern}        % Caractères plus lisibles
  \usepackage{babel}          % Réglages linguistiques (avec french)
  \pagestyle{empty}           % N'affiche pas de numéro de page
  \usepackage{array}
\begin{document}
\begin{tabular}{|>{$}c<{$}|l|}
  \hline
  u_0 & zéro \\
  u_1 & un   \\
  u_2 & deux \\
  \hline
\end{tabular}
\end{document}
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Compilation... . . .