共查询到19条相似文献,搜索用时 83 毫秒
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本文研究边界条件中带有扰动参数的积分边值问题正解的存在性与不存在性及扰动参数对正解存在性的影响.利用不动点指数理论,得出边值问题至少有一个正解、两个正解以及无解的充分条件. 相似文献
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闫东明 《高校应用数学学报(A辑)》2014,(2)
应用Dancer全局分歧理论,研究变系数Neumann边值问题一个正解及多个正解的存在性,其中m∈C[0,1],f:[0,1]×[0,∞)→[0,∞)连续.给出了此类问题有一个正解及多个正解存在的与其相应线性问题第一个特征值有关的充分条件,该条件中所涉及的值是最优的. 相似文献
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本文应用锥上的不动点指数理论,研究四阶两点边值问题—个正解及多个正解的存在性,给出了此类问题有一个正解及多个正解存在的与其相应线性问题的第一个特征值有关的充分条件,该条件中所涉及的值是最优的. 相似文献
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一般Lidstone边值问题的n个正解的存在性 总被引:22,自引:2,他引:20
考察了含所有偶数阶导数的一般Lidstone边值问题的正解和对称正解.通过 选择合适的Banach空间和锥,对该问题建立了n个正解或者对称正解的存在性,其 中n是一个任意的自然数.基本工具是等价范数和锥拉伸与锥压缩型的Krasnosel'skii 不动点定理. 结论的主要条件是局部的.换言之,如果非线性项f在某些有界集上的 "高度"是适当的,则该问题可以具有n个正解. 相似文献
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讨论了二阶带一阶导数的微分方程组m点边值问题正解的存在性,利用一个新的不动点定理,得到上述问题具有一个正解的充分条件. 相似文献
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关于M/M/n排队模型的动态解及稳定性 总被引:12,自引:1,他引:11
文章讨论动态 M/M/n排队模型 ,运用算子半群理论证明了该模型动态正解的存在唯一性 .并进一步表明零点是系统的一个本征值 ,相应的本征函数为系统的一个定态正解 ,系统的动态正解强稳定到定态解 相似文献
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In this work we give a non decreasing sequence of positive eigenvalues of the weighted p-biharmonic operator with weight and
with Navier boundary conditions, then we study the simplicity and the isolation of the first positive eigenvalue. Finally,
we study the one dimensional case. 相似文献
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Nonradial positive solutions of the ‐Laplace Emden–Fowler equation with sign‐changing weight 下载免费PDF全文
Ryuji Kajikiya 《Mathematische Nachrichten》2016,289(2-3):290-299
In this paper we study the p‐Laplace Emden–Fowler equation with a radial and sign‐changing weight in the unit ball under the Dirichlet boundary condition. We show that if the weight function is negative in the unit ball except for a small neighborhood of the boundary and positive at somewhere in this neighborhood, then no least energy solution is radially symmetric. Therefore the equation has both a positive radial solution and a positive nonradial solution. Moreover, we prove in the one dimensional case that if the neighborhood is large, then a positive solution is unique. 相似文献
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本文研究了一类四阶奇异边值问题.通过建立一个特定的锥,利用Leggett-Williams不动点定理,从而在一定的条件下得到一类四阶奇异边值问题对称正解的最优存在性,推广了奇异边值问题对称正解的最优存在性的结果. 相似文献
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Simon Raulot 《Annals of Global Analysis and Geometry》2011,39(4):337-359
In this article, we define the Green function for the Dirac operator under two local boundary conditions: the condition associated
with a chirality operator (also called the chiral bag boundary condition) and the MIT bag boundary condition. Then we give
some applications of these constructions for each Green function. From the existence of the chiral Green function, we derive
an inequality on a spin conformal invariant which, in some cases, solves the Yamabe problem on manifolds with boundary. Finally,
using the MIT Green function, we give a simple proof of a positive mass theorem previously proved by Escobar. 相似文献
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本文证明了一类含参数$\lambda>0$的半正微分边值系统正解的存在性结果.在非线性项满足次线性条件的情况下,证明了对于充分大的$\lambda>0$,方程组至少存在一个正解. 相似文献
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Roger Chen 《Proceedings of the American Mathematical Society》2001,129(7):2163-2173
In this paper we consider a non-self-adjoint evolution equation on a compact Riemannian manifold with boundary. We prove a Harnack inequality for a positive solution satisfying the Neumann boundary condition. In particular, the boundary of the manifold may be nonconvex and this gives a generalization to a theorem of Yau.
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Thsi paper is concerned with a positive solution u of the non–homogeneous p–Laplacian equation in an open, bounded, connected subset Ω of Rn with C2 boundary. We assume that u verifies overdetermined boundary conditions and we prove that of us has only one critial point Ω thenΩ is a ball and u is radially symmetric; to prove this result we use the moving planes method introduced by J.Serrien. Using the same technique we also prove that the result is stable in the following sense: the boundary of Ω tends to the boundary of a sphere as the diameter of the critical set u tends to 0. 相似文献
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设M为一带边界M的紧致Riemann流形,本文考虑M上的下述混合边值条件的特征值问题 (△u+v_1u=0, u/n+αu|M=0,)其中n为M的外法向单位向量,α为一正常数。 相似文献
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Lixin Yu 《Nonlinear Analysis: Theory, Methods & Applications》2011,74(4):1073-1087
In this paper, by means of a constructive method based on the existence and uniqueness of the semi-global classical solution, we establish the local exact boundary observability for a kind of second-order quasilinear hyperbolic system in which the number of positive eigenvalues and the number of negative ones are not equal. As an application, we obtain the one-sided local exact boundary observability and two-sided local exact boundary observability with fewer observed values for first-order quasilinear hyperbolic systems of diagonal form with boundary conditions in which the diagonal variables corresponding to the positive eigenvalues and those corresponding to the negative ones are decoupled. 相似文献