共查询到20条相似文献,搜索用时 46 毫秒
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本文给出了1-集压缩映射的一些新的非零不动定理,它们推广和改进了[1,2,4,5]中的某些重要定理。 相似文献
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半紧1-集压缩映射的不动点指数和不动点定理 总被引:2,自引:0,他引:2
张庆雍 《数学年刊A辑(中文版)》1984,(1)
本文目的是研究半紧1-集压缩映射的不动点指数概念和这种映射的不动点以及一般的k-集压缩映射正固有值的存在性定理,我们的结果改进和推广了一些已知的定理。 相似文献
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随机1-集压缩算子的随机不动点指数和随机不动点定理 总被引:24,自引:0,他引:24
在[1]中我们建立了随机拓扑度并得到系列新的随机不动点定理,本文建立了随机1-集压缩算子的随机不动点指数理论,得到一些新的随机不动点定理,为研究各类随机方程提供一些存在性原理,给出了在随机Hammerstein积分方程的应用. 相似文献
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刘威九 《纯粹数学与应用数学》1994,10(1):41-44
本文给出了与Leray-Schauder边界条件紧密相关的其它五种形式:弱LS、弹BP、LSB、弱CR和弱向内条件,并阐述这些条件之间关系。在此基础上,我们得到 了半紧1-集压缩映射的不动点定理及固有值。 相似文献
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本文建立了弱内向型集压缩映射的范数压缩与扩张型正不动点定理,并获得关于正特征元的一些结果. 相似文献
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In this paper, by introducing a new operator, improving and generating a p-Laplace operator for some $p > 1$, we discuss the existence and multiplicity of positive solutions to the four point boundary value problems of nonlinear fractional differential equations. Our results extend some recent works in the literature. 相似文献
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Robin型二阶m 点边值问题正解的存在性 总被引:2,自引:0,他引:2
马如云 《数学物理学报(A辑)》2004,24(3):307-318
设 a∈C[0,1], b∈C([0,1],(-∞, 0)). 设-1(t)为线性边值问题u″+a(t)u′+b(t)u=0,u′(0)=0, u(1)=1的唯一正解. 该文研究非线性二阶常微分方程m 点边值问题u″+a(t)u′+b(t)u+h(t) f(u)=0,=u′(0)=0, u(1)-∑[DD(]m-2[]i=1[DD)]α-i u(ξ-i)=d正解的存在性. 其中 d 为参数,ξ-i∈(0,1), α-i∈(0,∞) 为满足∑[DD(]m-2[]i=1[DD)]α-i-1(ξ-i)<1的常数,i∈{1,:,m-2}.在适当的条件下证得: 存在正常数 d+*, 使当0d+*时无正解. 相似文献
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研究n-阶m-点奇异边值问题其中h(t)允许在t=0,t=1处奇异,f(t,v_0,v_1,…,v_(n-2))允许在v_i=0(i=0,1,…,n-2)处奇异.利用锥拉伸与压缩不动点定理得到了上述奇异边值问题正解的存在性. 相似文献
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Yige Zhao 《Journal of Applied Analysis & Computation》2018,8(4):1170-1185
In this paper, we consider the existence of positive solutions for a class of nonlinear singular fractional differential systems with multi-orders. Our analysis relies on fixed point theorems on cones. Some sufficient conditions for the existence of at least one or two positive solutions for boundary value problem of nonlinear singular fractional differential systems with multi-orders are established. As an application, an example is presented to illustrate the main results. 相似文献
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In this article, we consider some properties of positive solutions for a new conformable integro-differential equation with integral boundary conditions and a parameter$$left{ begin{array}{l} T_{alpha}u(t)+lambda f(t,u(t),I_{alpha}u(t))=0,tin[0,1],u(0)=0,u(1)=betaint_{0}^{1}u(t)dt ,betain[frac 32,2), end{array}right.nonumber$$where $alphain(1,2]$, $lambda$ is a positive parameter, $T_{alpha}$ is the usual conformable derivative and $I_{alpha}$ is the conformable integral, $f:[0,1]timesmathbf{R^{+}}timesmathbf{R^{+}}rightarrow mathbf{R^{+}} $ is a continuous function, where $mathbf{R^{+}}=[0,+infty)$.We use a recent fixed point theorem for monotone operators in ordered Banach spaces, and then establish the existence and uniqueness of positive solutions for the boundary value problem. Further, we give an iterative sequence to approximate the unique positive solution and some good properties of positive solution about the parameter $lambda$. A concrete example is given to better demonstrate our main result. 相似文献
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In our paper, by employing Krasnoselskii fixed point theorem, we investigate the existence of multiple positive periodic solutions for functional differential equations
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韦忠礼 《应用数学学报(英文版)》1999,15(1):94-97
1.IntroductionTheexistenceanduniquenessofsolutionsofdelaydifferentialequationsinaBanachspacehavebeenstudiedbymanyauthors(see[1--4]).Inthispaper,weshallapplythefixedpoillttheoremstoinvestigatetheexistenceofpositivesolutionsofnonlinearneutraldifferentialdifferenceequationsinaBanachspace.LetRbethefieldofrealnumbers,andletR ={tERIt20},to>0,J=[to, co)'ConsiderthenonlinearneutraldifferentialdifferenceequationinaBanachspaceE.mI(x(t)~Zci(t)x(t~ri))' ZPj(t)fj(x(t~D))=0,(1)i=1j=1wherefiEC[P,PI,f… 相似文献