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126 Chapter 4 Spectral Analysis<br />

fact, that<br />

and<br />

lim<br />

n→∞ Ef(λ) ˆ f(λ)<br />

lim<br />

n→∞<br />

<br />

|j|≤mn<br />

W 2<br />

n (j)<br />

−1<br />

Cov( ˆ<br />

f (λ), ˆ<br />

f(ν))<br />

⎧<br />

⎪⎨<br />

2f<br />

⎪⎩<br />

2 (λ) if λ ν 0orπ,<br />

f 2 (λ)<br />

0<br />

if 0

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