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npfedwards

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 Which one of the following is true for all vectors $u$, $v$ and $w$ where $u\cdot v = 0$ and $u\cdot w = 0$?

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+2 Given $f(f(x))$ can we find $f(x)$?
+30 Which one of the following is true for all vectors $u$, $v$ and $w$ where $u\cdot v = 0$ and $u\cdot w = 0$?

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 Does Euler Characteristic > 2 imply not connected

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