The process \(X_{t}\) is said to be stationary if for any \(t_{1},t_{2},t_{3}, . . .\) and \(τ\), \(\mu_{t_{1},t_{2},t_{3},\cdots}=\mu_{t_{1}+\tau,t_{2}+\tau,t_{3}+\tau,\cdots}\)
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