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∂ 2<br />
ɛ<br />
∂a<br />
= 2r + 2Ra <br />
Ra = −r <br />
y (n) r (n) <br />
r (n) ˆ = 1<br />
N−n <br />
(y (n) y (n + k)) ≈ E [y (k) y (n + k)]<br />
N<br />
<br />
k=0