本文研究了定期信用支付条件下的多阶段货价变动型存贮问题，得到了最优订购策略并设计了算法以说明模型的使用。

EOQ under date-terms supplier credit: a comment on a paper by Carlson and Rousseau.

对供应链库存进行有效控制是提高核心企业乃至整个供应链绩效的一条主要途径，也是在与其他供应链竞争中赢得优势的重要保证。本文研究了在供应商提供定时信用支付条件下的库存作控制模型。并由启发式逼近算法得到了最优订购策略，这突破了以往始终用数量折扣作为激励机制来研究供应链成员企业间合作的研究框架，为进一步研究供应链的整合问题提供了新的思路。

This note is concerned with the inventory models with finite horizn and cost changes. We presented more specific on the optimal inventory policy than those in previous papers and showed that some of the resuts in Lev and Weiss' (1990) paper are not necessarily optimal.

In this paper we show how polynomial mappings of degree K from a union of disjoint intervals onto [−1, 1] generate a countable number of special cases of generalizations of Chebyshev polynomials. We also derive a new expression for these generalized Chebyshev polynomials for any genus g, from which the coefficients of xn can be found explicitly in terms of the branch points and the recurrence coefficients. We find that this representation is useful for specializing to polynomial mapping cases for small K where we will have explicit expressions for the recurrence coefficients in terms of the branch points. We study in detail certain special cases of the polynomials for small degree mappings and prove a theorem concerning the location of the zeroes of the polynomials. We also derive an explicit expression for the discriminant for the genus 1 case of our Chebyshev polynomials that is valid for any configuration of the branch point.