Vector operations

by Bertrandkis
Tags: operations, vector
Bertrandkis is offline
Apr10-08, 06:34 AM
P: 25
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.
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HallsofIvy is offline
Apr10-08, 06:44 AM
Sci Advisor
PF Gold
P: 38,877
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].

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