On considĂšre lâensemble $E$ des matrices carrĂ©es dâordre 2 de la forme:
$$\begin{pmatrix}
a&b\\1-a&1-b
\end{pmatrix} ~~\text{oĂč}~~(a,b)\in\mathbb C^2$$
Montrer que $~E~$ est stable pour la multiplication.
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