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一类四阶边值问题正解的存在性
引用本文:李永祥.一类四阶边值问题正解的存在性[J].纯粹数学与应用数学,2000,16(3):54-58,65.
作者姓名:李永祥
作者单位:西北师范大学数学系,兰州,730070
基金项目:甘肃省自然科学基金!(ZS991-A25-007-2),甘肃省教委科研基金!(981-30)
摘    要:讨论了四阶常微分方程边值问题u^(4)=βu″-au=ψ(t)f(u),u(0)=u(1)=u″(0)=u″(1)=0的正解的存在性,利用锥拉伸与锥压缩不动点定理证明了,当f(u)在u=0及u=∞超线性或次线性增长时,该问题至少存在一个正解。

关 键 词:四阶边值问题  锥拉伸  锥压缩不动点定理  正解  存在性  弹性梁
文章编号:1008-5513(2000)03-0054-05

The existence of positive solutions of a fourth-order boundary value problem
LI Yong-xiang.The existence of positive solutions of a fourth-order boundary value problem[J].Pure and Applied Mathematics,2000,16(3):54-58,65.
Authors:LI Yong-xiang
Abstract:In this paper,the existence of positive solutions of the fourth-order boundary value problem is discussed. The auther shows that this problem has at least one positive solutions when f(u) is superlinear or sublinear by employing the fixed ponit theorem of cone extension or compression.
Keywords:fourth-order boundary value problem  the fixed ponit theorem of cone extension of compression  positive solution  existenc
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