【摘要】 针对一类常微分方程奇摄动边值问题,介绍了用Vasil’eva边界层函数法来构造Nagumo定理中的上下解,并用微分不等式证明了解的存在性和进行了余项估计,用边界层函数法来构造上下解更具有普遍性,且使用方便。更多还原

【Abstract】 This paper discussed a kind of singularly perturbed ODE with boundary value. The upper and lower solutions defined in Nagumo Theorem by means of Vasil’eva’s boundary layer function method were contructed. Actually, it is of great universality and easy to use. After the construction, the existence of the solution of this singularly perturbed problem and estimation of the remainder terms with differential estimation of inequalities was proved.更多还原