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# Cauchy-Schwarz Proof help. watch

1. I can do the 'algebra' for the proof, but how does it prove it, whats is the intuition behind the first equation involving the expectation of x1 added to the product of x2 and lambda ?

2. is just any real number; the flexibility of using 'any real number' means you can set it to be what you like, which is essentially what they do in the proof. What specific bits are you confused about?
3. (Original post by nuodai)
is just any real number; the flexibility of using 'any real number' means you can set it to be what you like, which is essentially what they do in the proof. What specific bits are you confused about?
ok I kind of need a running commentary of it so,

what is the use of lambda in the below, why have we started off from this

E[(X(1) +lambdax(2))^2]

?

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