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}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Compilation... . . .