Abstract
In this paper, a semi-Markovian random walk process ( X ( t ) ) with a discrete interference of chance is constructed and the ergodicity of this process is discussed. Some exact formulas for the first- and second-order moments of the ergodic distribution of the process X ( t ) are obtained, when the random variable ζ 1 has an exponential distribution with the parameter λ > 0 . Here ζ 1 expresses the quantity of a discrete interference of chance. Based on these results, the third-order asymptotic expansions for mathematical expectation and variance of the ergodic distribution of the process X ( t ) are derived, when λ → 0 .
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