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IN a recent paper by R. R. P. Jackson1 an interesting model of a certain class of stock problems is constructed. In effect, Jackson considers that the distribution of issues from stock is random with a mean value jt units per unit of time. The purpose of this note is to generalize the results of Jackson to the case when the time interval between demands is a random variable with arbitrary distribution function and the number of units issued per demand is also a random variable with arbitrary distribution function.
П. Д. Финч (Sat,) studied this question.