$E[S_n^2] \le n\,(E[Y_0^2] + 2\sum_k |E[Y_0Y_k]|)$ for a stationary sequence · Prove2Me

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$E[S_n^2] \le n\,(E[Y_0^2] + 2\sum_k |E[Y_0Y_k]|)$ for a stationary sequence · Prove2Me