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中文摘要：
本文研究薄层流中出现的一类三阶奇摄动数学模型．本文不采用研究其渐近等价的二阶奇摄动微分方程的方法，而利用边界层函数法，直接讨论该数学模型的渐近解，并严格地证明了解的存在唯—性和其渐近解的一致有效性．本文的结果不仅去掉了以往方法所必须的位势条件，纠正了某个不适定的假设，而且推广了以往的结果．
英文摘要：
In this paper, we investigate a class of singularly perturbed third-order boundary value problem, which arises in the thin film flows. Unlike a previous technique to study an asymptotically equivalent second-order problem in stead of the third-order one, we study the mathematical model directly for its asymptotic expansion by the boundary function method and prove the existence and uniqueness of the exact solution of the studied problem as well as the uniform validity of its asymptotic solution in a rigorous way. We completely remove the usual potential condition and correct some error of a certain assumption in the previous literature, under which, the previous result is extended in this paper.
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