摘要
本文利用上下解方法和不动点理论研究一阶非线性常微分方程的极值解,改进和推广了现有结果。
By the use of methods of upper-lower solutions and theory of fixed points,extremal solutions for first order nonlinear differential equations are investigationed and our results improve the existing ones.
基金
安徽省自然科学资金资助课题(2OOOjl236)
关键词
初值问题
周期边值问题
上下解
不动点
initial value problems
periodic boundary value problems
upper-lower solutions
fixed points
