Question: 1.* 4. Assume that 9{X 1 = O} < 1. Prove that x is a recurrent value of the random walk if and only if
1.* 4. Assume that 9{X 1
= O} < 1. Prove that x is a recurrent value of the random walk if and only if 00 E 9i'){ISn xl < E} 00 for every E > O.
1l=1
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