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Matrices - Conditions for $AB+BA=0$

matrices asked Aug 22 '12 at 14:51

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« L'essentiel est que vous soyez arrivés » : pourquoi le subjonctif ?

grammaire subjonctif asked Mar 27 at 12:02

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$x$, $y$, $x+y$ and $x-y$ are prime numbers. What is their sum?

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The minimum value of $a^2+b^2+c^2+\dfrac{1}{a^2}+\dfrac{1}{b^2}+\dfrac{1}{c^2}?$

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