Question

Asked Jan 26, 2020

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Show that except in degen-erate cases, (u * v) * w lies in the plane of u and v, whereas u * (v * w) lies in the plane of v and w. What are the degenerate cases?

Step 1

Show that except in degenerate cases, (u x v) x w lies in the plane of u and v, whereas u x (v x w) lies in the plane of v and w.

Step 2

Let m = (u x v) x w.

To prove m, u, ...

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