In the paper, several numerical methods based on the models of delay differential equations and partial delay differential equations are constructed.

本论文以延迟常微分方程和延迟偏微分方程为模型构造了一些数值方法，并对每一个数值方法都进行了理论分析。

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Because of rising loan amounts and interest rates, a worrisome trend has emerged: Loans where the borrower can make only partial payments or has gotten a delay are up to 6.4% from 4.7% a year ago. (Borrowers start repaying after graduation.) Meanwhile, Sallie Mae has suffered earnings reversals, mainly from fumbled derivatives, which have pulled the stock down a tad.

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