A note on random walks

Abstract
Let {Xn} be a random walk between reflecting barriers at 0 anda> 0 with jumps {Zn}. Bywe mean the random walk between absorbing barriers at— aand 0+ with the same jumps {Zn}. It has been known for some time that when {Zn} is a sequence of mutually independent and identically distributed random variables, and 0 ≦x<a, we have for alln:

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