Comment gérer les espaces en mode mathématique ?#

Le tableau suivant donne les différentes commandes d’espacement mathématique :

Commande

Effet d’espacement

Commentaire

\!

Réduction de l’espace

rien

Affichage en l’absence de commande

\,

Espace fine

\;

Espace moyenne

\

 

Espace normale (la contre-oblique suivie d’un espace)

\quad

Espace cadratin

\qquad

Espace double cadratin

Voici un exemple d’utilisation de ces commandes :

Exemple compilable et éditable
\documentclass{article}
\usepackage[T1]{fontenc} % Encodage T1 (adapté au français)
\usepackage{lmodern} % Caractères plus lisibles
\pagestyle{empty} % N'affiche pas de numéro de page
\usepackage{amssymb} % Caractères des ensembles
\begin{document}
\[
\forall \lambda \in \mathbb{R}
\quad
\int _{a}^{b}\lambda \, f(x)
\, \mathrm{d} x
=
\lambda \, \int _{a}^{b}f(x)
\, \mathrm{d} x
\]
\end{document}
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Compilation... . . .