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May 19, 2012 at 13:16 comment added Julien Puydt If you use the derivative table for a scalar product (applied to the square product), from v.v=cte, you get 2v.a=0 -- that doesn't look that non-elegant. In fact, I use this very example to show my students (which are more into physics) that this rule gets results they're already well-acquainted with. That convinces them more than the proof...
Oct 19, 2010 at 14:11 history made wiki Post Made Community Wiki by S. Carnahan
Sep 27, 2010 at 5:53 history answered Gjergji Zaimi CC BY-SA 2.5