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This paper deals with the existence of monotone positive solutions to a type of three point boundary value problems of nonlinear second-order differential equations with p-Laplacian operator .

利用锥拉伸与锥压缩不动点定理,研究一类具 p-Laplace算子的二阶微分方程的三点边值问题单调正解的存在性,给出了单调正解存在的充分条件,并确定了解曲线的凹凸性。

Furthermore, the proof of correctness of CalcCycleTime is also the proof of the existence of cycle time, the existence of generalized eigenvectors, and the duality theorem.

本论文中给出的CalcCycleTime算法的正确性证明同时是周时存在性、广义特征向量存在性和对偶定理的证明。

The unique existence theorem forutility function based on the new axioms,which is the base of lattice-orderdecision-making theory,is obtained in this dissertation.

本论文研究了在格序决策行为公理体系之下效用函数的存在性问题,并给出了相应的存在惟一性定理,为格序决策理论与方法的研究奠定了基础。

In addition, when the nonlinearities have the properties of mixed-monotonicity, the existence of a positive solution for difference equations is ob-tainded by using fixed point theorem in a cone or fixed point theorem of conic expansion and compression.

在最后一部分讨论了带有特征值的非线性二阶差分方程正解存在性问题,利用锥压缩与拉伸不动点定理及逼近性理论,在一定的假设条件下,得到了差分方程正解存在性。

And obtain an analogy result of Kazdan and Warner's, and then we use our theorem to study the vortex equation in Holomorphic line bundle over non-Kahler complex manifolds.

在第三部分我们考虑了一类Kazdan-Warner型的方程,并且证明了一个存在性的定理,借助于这一结果我们给出了一般的紧复流形M上的全纯线丛上的vortex方程解的存在性的一个充分性条件,或许这一考虑有其它方面的作用的。

By increasing the condition of the integral mean value theorem,we prove that the existence of intermediate point and the existence of interval are corresponding to each other.

给出了积分中值定理的一个注记,证明了中值点的存在性与覆盖中值点的区间的存在性是相互对应的。

Meanwhile, we proved the unboundedness of solutions of Lienard equations with weaker damping terms when the rotation number is irrational. We still obtained the unboundedness of solutions of Lienard equations with asymmetric nonlinearities at resonance.

另外,还通过应用Birkhoff遍历定理证明了当旋转数为无理数时,弱阻尼的Lienard方程无界解的存在性;同时,证明了共振条件下具有不对称非线性项的Lienard方程无界解的存在性。

Firstly, the eigenvalue problem of a class of second order elliptic equation with critical potential and indefinite weights is considered. Then, using critical point theory, Trudinger-Moser inequality and the properties of the first eigenvalue, we prove the existence of a nontrivial solution for a class of nonlinear elliptic with critical potentialand indefinite weights in R~2. Secondly, we prove the existence of nontrivial solutions for a class of subcritical and critical elliptic systems with indefinite part in R~2 byusing a generalized linking theorem, Trudinger-Moser inequality and concentration-compactness principle.5. The existence of at least three weak solutions for discrete boundary value problem is established by using a three critical point theorem introduced by Ricceri.

首先,讨论了R~2中一类带不定权且含临界位势的二阶椭圆型方程的特征值问题,并借此特征值问题的第一特征值性质,利用山路引理及Trudinger-Moser不等式,证明了R~2中一类带不定权且含临界位势的非线性椭圆型方程非平凡解的存在性;其次,利用广义环绕定理,Trudinger-Moser不等式及集中列紧原理,得到了R~2上一类具有强不定部分的半线性椭圆型方程组在非线性项分别为次临界增长和临界增长情形下非平凡解的存在性。

In order to prove the existence of the periodic boucing solutions, firstly we will introduce a new coordinate transformation, transform the system from right half plane to the whole plane. And give the relation of the eigenvalues of Hill's equation and the rotation numbers, using this approach and Pioncar -Birkhoff twist theorem, we proved the existence of the periodic bouncing solutions for asymptotical linear oscillator.

对于周期解的存在性证明,我们引进新的坐标变换把右半平面上的碰撞问题转化到整个平面上,给出旋转数与Hill方程的特征值的关系,并以此来度量渐近线性振子,再应用Pioncaré-Birkhoff扭转定理得到周期碰撞解的存在性。

Chapter 2 discuss firstly the local existence of solutions for a class of abstract functionalintegro-differential equations with unbounded delay by Schauder's fixed point theorem, then byintroducing an inequality condition and applying the continuity property of solutions it obtainsthe global existence of the solutions.

第二章先利用Schauder不动点定理讨论一类具有无限时滞抽象泛函积分微分方程解的局部存在性,然后引入一不等式条件并利用解的延拓性质获得了解的整体存在性

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