Answers
7. Let 
, 
Then , 
Now , 
We know that by Cauchy-Schwarz inequality ,
This is the required relation .
( In In) = n
v = (v1 U2 ...Un)
uv' = (u uz ...un)
Uv' || = |U101 + 4202 + ... + un Un
||4|| = Vu} + uż + ... + un
|||| = v+ + + %
(u + ... +u) (ví + vž + ... +) > (4101 + ...
+ unun)
• < ||
.
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