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Homework Statement
Is it possible for
projuv=projvu
Homework Equations
The Attempt at a Solution
This can only occur if:
[tex]\frac{|\mathbf{u\cdot v}|}{^{\|u\|^{2}}}\mathbf{u} = \frac{|\mathbf{u\cdot v}|}{^{\|v\|^{2}}}\mathbf{v}[/tex]
So if either is the zero vector, it is true. How can I prove that it can only be true if either is the zero vector, or v=u?