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本文针对渗流力学和油田开发计算中常用的一种特殊函数——指数积分函数的渐近展开式,综合了有关数学专著中的若干证明方法,运用普通的微积分知识,给出了一种比较系统的容易理解的初等证明方法。
Aiming at the asymptotic expansions of a kind of exponential integral function commonly used in seepage mechanics and oil field development and calculation, this paper synthesizes some proof methods in mathematical monographs and uses a common calculus knowledge to give a comparison System easy to understand primary proof method.