Question

Cine ma poate ajuta sa-mi rezove exrecitiul:verificati daca O2 si I2°€A?

Answer 1

$O_2=\begin{pmatrix}0 &0 \\ 0 & 0\end{pmatrix}. \, \, O_2 \in A \Leftrightarrow x=y=z=0, \, \textrm{dar} \, z \in \mathbb{R} ^* \Rightarrow O_2 \notin A$

[tex]I_2=\begin{pmatrix}1 &0 \\ 0 & 1\end{pmatrix}. \, \, I_2 \in A \Leftrightarrow x=z=1, \, y=0 \, \Rightarrow I_2 \in A [/tex]