# Vector operations

by Bertrandkis
Tags: operations, vector
 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.
 PF Patron Sci Advisor Thanks Emeritus P: 38,395 Your are right. That is a problem. I am also surprised that is not $|x|^2+ |y|^2$ on the right. I suspect that they mean dot product. I suggest you look at $|(x-y)\cdot(x-y)|$.

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