Abstract
SUMMARY: This paper discusses problems of first emptiness in a finite discrete dam (i) before overflow occurs, and (ii) where there is overflowing. Equations for probabilities of first emptiness in both cases are derived, and their generating functions found. The latter are shown to be the ratio of two polynomials. For geometric inputs, explicit expressions for these polynomials may be found similar to Feller’s results for classical random walk.

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