A.(BXC) /= 0, must a,b,c be linearly independent?
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Originally Posted by szpengchao A.(BXC) /= 0, must a,b,c be linearly independent? Do you mean $\displaystyle a \cdot (b \times c) = 0$ or $\displaystyle a \cdot (b \times c) \neq 0$? Either way if a,b,c lie in the same 2 dimensional plane, then $\displaystyle a \cdot (b \times c) = 0$. Can you see that?
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