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Finiteness of waiting-time moments in general stationary single-server queues. (English) Zbl 0772.60073
Consider a stable single-server queue in which the arrivals occur at the epochs of a stationary point process that is not necessarily a renewal process and the service times are i.i.d. random variables $$\{S_ n\}$$. Let $$W$$ be a random variable distributed as the stationary customer waiting time. A classical result shows that when the arrival process is renewal, for $$\gamma>0$$, $$EW^ \gamma<\infty$$ if and only if $$ES_ 1^{\gamma+1}<\infty$$. Analogues of this result for the case when the arrivals no longer form a renewal process are developed. Two special cases are considered in detail: when the arrivals are generated by a Cox process and when the sequence of interarrival times contains an embedded regenerative phenomenon.

##### MSC:
 60K25 Queueing theory (aspects of probability theory) 60G55 Point processes (e.g., Poisson, Cox, Hawkes processes)
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