## On eigenvalues of the generator of a $$C_0$$-semigroup appearing in queueing theory.(English)Zbl 1473.47015

Summary: We describe the point spectrum of the generator of a $$C_0$$-semigroup associated with the M/M/$$1$$ queueing model that is governed by an infinite system of partial differential equations with integral boundary conditions. Our results imply that the essential growth bound of the $$C_0$$-semigroup is 0 and, therefore, that the semigroup is not quasi-compact. Moreover, our result also shows that it is impossible that the time-dependent solution of the M/M/1 queueing model exponentially converges to its steady-state solution.

### MSC:

 47D06 One-parameter semigroups and linear evolution equations 90B22 Queues and service in operations research
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### References:

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