Teorema Kaplansky de caracterizare a C*-algebrelor necomut.

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Cezar Lupu
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Teorema Kaplansky de caracterizare a C*-algebrelor necomut.

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Fie \( A \) o \( C^{*} \)-algebra. Atunci \( A \) este necomutativa daca si numai daca exista \( a\in A \), \( a\neq 0 \) si \( a^2=0 \).
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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