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\node[color=black] at ([shift={(-17mm,-8mm)}]m-3-1.north) {$\Mat_{\mathscr{B},\mathscr{B}'}(f)=$};
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\node[color=black] at ([shift={(-17mm,-8mm)}]m-3-1.north) {$\Mat_{\mathscr{B},\mathscr{B}'}(f)=$};
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\node[color=blue](C) at ([shift={(-17mm,-5mm)}]m-6-1.south) {Composantes du vecteur $f(e_j)$ dans la base $\mathcal{B}'$};
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