Talk:Properties of Dot Product

Just a note:-
 * (I think) the "Alternative proofs" are circular: the fact that $u \cdot v = \| u\| \|v\| \cos\theta$ is assumed, but in the proof of this fact, $(4)$ and $(5)$ are used.


 * Of course it works because of the first set of proofs, but perhaps it's worth a note to this effect --Linus44 08:59, 11 May 2011 (CDT)