Matrice de ordinul 2 cu elemente intregi
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Matrice de ordinul 2 cu elemente intregi
Exista matrice \( A\in M_{2}(\mathbb{Z}), A\neq I_{2} \) astfel incat \( A^3+A^2+A=3I_{2} \)?
An infinite number of mathematicians walk into a bar. The first one orders a beer. The second orders half a beer. The third, a quarter of a beer. The bartender says “You’re all idiots”, and pours two beers.
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