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@@ -29,3 +29,10 @@ up:: [[groupe]]
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> - Les groupes symétriques d'indice $n \geq 3$ sont non-commutatifs
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# Exemples
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$\mathfrak S_2 = \left\{ \begin{pmatrix}1&2\\1&2\end{pmatrix}; \begin{pmatrix}1&2\\2&1\end{pmatrix} \right\}$
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$\mathfrak S_3 = \left\{ \begin{pmatrix}1&2&3\\1&2&3\end{pmatrix}; \begin{pmatrix}1&2&3\\1&3&2\end{pmatrix}; \begin{pmatrix}1&2&3\\2&1&3\end{pmatrix}; \begin{pmatrix}1&2&3\\2&3&1\end{pmatrix}; \begin{pmatrix}1&2&3\\3&1&2\end{pmatrix}; \begin{pmatrix}1&2&3\\3&2&1\end{pmatrix}\right\}$
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