#Tester
[tex] Sa~se~rezolve~ecuatiile~x\sigma= \tau ~si ~\sigma x=\tau :\\ \\ \[
\sigma = \bigl(\begin{smallmatrix}
1 & 2 & 3 & 4 & 5 \\
2 & 3 & 4 & 5 & 1
\end{smallmatrix}\bigr)
\]
\\
\[
\tau = \bigl(\begin{smallmatrix}
1 & 2 & 3 & 4 & 5 \\
5 & 4 & 1 & 3 & 2
\end{smallmatrix}\bigr)
\] [/tex]