研究Banaeh空间中的四阶非线性常微分方程两点边值问题正解的存在性,其中a:[0,1]→R,f:[0,1]×E→E连续。通过构造一个特殊的锥,在相应线性微分方程第一特征值的相关条件下,运用凝聚映射的锥拉伸与锥压缩不动点定理,获得该问题正解的存在性与多重性结果。利用新的非紧性测度估计技巧,删去了非线性项f一致连续的要求,即使在特殊的纯量空间中讨论,所得到的结果也是新的。
Consider the existence of positive solutions to the fourth-order two-point bounda~ value problem where a : [ 0, 1 ] →R,f: [ 0, 1 ] x E→E are continuous. Under the certain conclusions on the first eigenvalue of the relevant linear differential equation, the existence and multiplicity results of positive solutions are obtained by con- structing a special cone and using the Krasnoselskii fixed point theorem of condensing mapping. By introducing a new estimation technique on non-compact measure, assumption that uniform continuity of the nonlinear termf is de- leted. The obtained results are still new even if in special scalar space.