1. Apr 10, 2008 #1

   Bertrandkis

   

   1. The problem statement, all variables and given/known data
   Let x and y be to vectors
   Verify whether |xy|<=|x|+|y| for all x,y
   
   
   3. The attempt at a solution
   My first problem with this question is that it does not tell us whether the operation xy is the same as x.y (dot product) or a cross product.

    

   Bertrandkis, Apr 10, 2008
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3. Apr 10, 2008 #2

   HallsofIvy

   

   Science Advisor

   Your are right. That is a problem. I am also surprised that is not [itex]|x|^2+ |y|^2[/itex] on the right. I suspect that they mean dot product. I suggest you look at [itex]|(x-y)\cdot(x-y)|[/itex].

    

   HallsofIvy, Apr 10, 2008

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