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## Homework Statement

State why (u,v) is not an inner product for u=(u1,u2) and v=(v1,v2) in R2

(u,v)=-u2v2

## Homework Equations

(u,v)=(v,u)

c(u,v)=(cu,v)

(v,v)=>0 and (v,v)=0 if only if v=0

## The Attempt at a Solution

I am having trouble understanding this problem and how to start it. Please help. Thank you