摘要
利用格林函数和上。
In this paper, the author prove the existence of solutions of some nonlinear 4-point boundary valve problems for fourth_order nonlinear differential equations by Green's functions and method of the Upper and lower solutions.
出处
《沈阳师范学院学报（自然科学版）》
2001年第1期4-10,共7页
Journal of Shenyang Normal University(Natural Science)
