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$W_p:= \exists k \in N \text{ such that } \liminf_{i\rightarrow\infty} S_{[P_i, P_{i+k}]} > 0$ $W_n:= \exists k \in N \text{ such that } \limsup_{i\rightarrow\infty} S_{[N_i, N_{i+k}]} < 0$ $W_n:= \exists k \in N \text{ such that } \liminf_{i\rightarrow\infty} |S_{[N_i, N_{i+k}]}| > 0$
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Thu, 18 Mar 2021 18:25 GMT