Petru Morosan - Trident Problema 1
Petru Morosan - Trident Problema 1
Demonstrati ca daca $A,B \in M_2( \mathbb{Q} )$ cu $A \neq O_2$ si $r \in \mathbb{R} - \mathbb{Q}$ a.i. $AB-rBA=A$ atunci $A^2=O_2$.
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