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Se considera G=[tex]\left[\begin{array}{ccc}1&x\\0&1\\\end{array}\right][/tex]; x apartine R. si legea de compozitie GxG->G (A,B)->A°B
[tex]\left[\begin{array}{ccc}1&1\\0&1\end{array}\right][/tex] AB[tex]\left[\begin{array}{ccc}1&-1\\0&1\end{array}\right][/tex] .Prechea (G,°) este grup?