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\documentclass{article} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[french]{babel} \usepackage{amssymb} % fournit \mathbb, \mathcal, \leqslant ... \begin{document} % \mathbb vient de amssymb. Sans ce \usepackage, % LaTeX renvoie : ! Undefined control sequence. L'ensemble des entiers naturels se note $\mathbb{N}$, celui des réels $\mathbb{R}$. \end{document}
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