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Yang [20] studies a deteriorating inventory model in which the supplier simultaneously offers the retailer either a conditional delay in payments or a cash discount. While considering the same inventory problem as that of Yang [20] in a systematic manner, the main purpose of this paper is twofold: First of all, since Yang [20] does not seem to have defined(More)
In a recent paper in this journal, Gautschi et al. presented an interesting expansion formula for the exponential integral E 1 (z) in a series of the incomplete Gamma function γ (α, z). Their investigation was motivated by a search for better methods of evaluating the exponential integral E 1 (z) which occurs widely in applications, most notably in(More)