Kelley Carlson
07/04/2023 · Primary School
considère les matrices suivantes de \( \mathcal{M}_{3}(\mathrm{R}): \mathrm{M}=\left(\begin{array}{lll}0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0\end{array}\right) \) et \( \mathrm{J}=\mathrm{M}+\mathrm{I}_{3} \). Calculer \( J^{2}, J^{3} \) (On admettra dans la suite que \( \left.\forall k \in \mathrm{~N}^{*}, J^{k}=3^{k-1} J\right) \) En remarquant que \( \mathrm{M}=\mathrm{J}-\mathrm{I}_{3} \), démontrer que, pour tout \( \mathrm{n} \in \mathrm{N}, \mathrm{M}^{\mathrm{n}}=(-1)^{\mathrm{n}} \mathrm{I}_{3}+\frac{1}{3}\left(2^{\mathrm{n}}-(-1)^{\mathrm{n}}\right) \mathrm{J} \).
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Calcul de \( J^{2} \) et \( J^{3} \): \( J^{2}=3J \) et \( J^{3}=9J \). Démonstration de \( M^{n}=(-1)^{n} I_{3}+\frac{1}{3}(2^{n}-(-1)^{n}) J \) en utilisant \( M=J-I_{3} \).
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