Question: Let e} = 1,1(2) = z} = 2.1(h) = 0 if h i 0 or h at :2. Prove that there exists no time series

Let e} = 1,1\"(2) = z} = 2.1\"(h) = 0 if h i 0 or h at :2. Prove that there exists no time series whose ACF would be f
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