积分双半群与抽象动力方程的可解性

本文从一类抽象积分微分方程的可解性，引人积分双半群的概念，并讨论了积分双半群的一些性质．利用积分双半群，说明了一类抽象动力方程的可解性，特别是抽象动力方程边值问题的可解性．     

SOLVABILITY OF FORWARD-BACKWARD SDES AND THE NODAL SET OF HAMILTON-JACOBI-BELLMAN EQUATIONS

The solvability of a class of forward-backward stochastic differential equations (SDEs for short) over an arbitrarily prescribed time duration is studied. The authors design a stochastic relaxed control problem, with both drift and difftusion all being controlled, so that the solvability problem is converted to a problem of finding the nodal set of the viscosity solution to a certain Hamilton-Jacobi-Bellman equation. This method overcomes the fatal difficulty encountered in the traditional contraction mapping approach to the existence theorem of such SDEs.     

NEARNESS,ACCRETIVITY, AND THE SOLVABILITY OF NONLINEAR EQUATIONS

ABSTRACT

In this paper our propose is to find a common term which is included in the assumptions of theorems proving existence of zeros, implicit functions, fixed points or coincidence points. This new point of view allows us to weaken the assumptions which guarantee the solvability of nonlinear equations and to recommend a possible unified treatment of several classes of operators which appear in the theory of nonlinear equations.     

Banach空间中非线性混合型微分积分方程的可解性

在序Ｂａｎａｃｈ空间中，研究了非线性混合型微分积分方程初值问题解的存在性，改进了文［１］中的相应结果．     

Banach空间中非线性脉冲Volterra型积分方程的可解性

本文利用“强极小锥”的概念,获得了Ｂａｎａｃｈ空间中非线性脉冲Ｖｏｌｔｅｒｒａ型积分方程整体解的存在性定理,改进了现有文献中的某些结果．     

一类带有单调型算子紧扰动的半线性方程的可解性

本文在算子单调性和紧性假设下研究了一类半线性算子方程Ａｕ－Ｔｕ＋Ｃｕｆ的可解性,其中Ａ,Ｔ和Ｃ映实自反Ｂａｎａｃｈ空间Ｘ中的闭凸子集到它的对偶空间Ｘ＊．我们的结果扩展或改进了Ｇｕａｎ［１］最近宣布的全部结果．     

REMARK ON UNIQUE CONTINUATION OF SOLUTIONS TO THE STOKES AND THE NAVIER-STOKES EQUATIONS

1IntroductionUnique continuation of solutions to the linear partial di?erential equations with analyticcoe?cients is well known.There are more general results in elliptic,parabolic and hyperbolicequations(cf.[8-10,12-13]and references therein).The continu…     

ON THE SOLVABILITY OF NONLINEAR BOUNDARY VALUE PROBLEMS FOR FUNCTIONAL DIFFERENTIAL EQUATIONS

Sufficient conditions are established for the solvability of the boundary value problem where p : C(I; R ⁿ) × C(I; R ⁿ) L(I; R ⁿ), q : C(I; R ⁿ) L(I; R ⁿ), l : C(I, R ⁿ) × C(I; R ⁿ) R ⁿ, and c _n : C(I, R ⁿ) R ⁿ are continuous operators, and p(x, ) and l(x, ) are linear operators for any fixed .     

一类非线性积分方程正解的存在唯一性

是人们关注的课题之一,1973年 P.J.Bushell 首先在[1]中用 Hilbert 投影距离证明了当 0<α<1时,方程(1)有唯一的正解;接着1975年 A.J.B.Botter 在文[2]中证明了在连续核 K(x,y)>0的情况下当 α=-1时方程(1)仍有唯一正解;此后便是讨论α>1的情况,1979年郭大钧在[3]中证明了若存在σ>0,使     

UNIQUE CONTINUATION AND PERSISTENCE PROPERTIES OF SOLUTIONS OF THE 2-COMPONENT DEGASPERIS-PROCESI EQUATIONS

In this article,the unique continuation and persistence properties of solutions of the 2-component Degasperis-Procesi equations are discussed.It is shown that strong solutions of the 2-component Degasp...     

平面上二阶椭圆方程的边界唯一延拓性质

设ｗ（ｒ）非负非增δ〉０，Ｄ为平面上的区域，Ｚ０∈αＤ，ｕ是Ｄ上的一个二阶椭圆方程的解，且│ｕ（ｚ）│≤Ｃｅｘｐ（－ｗ（│ｚ－ｚ０│）（Ａ）我们证明了，如果∫＾δ０ｗ（ｒ）ｄｒ＝∞，则ｕ＝０，若∫＾δ０ｗ（ｒ）ｄｒ〈∞，则有上半平面上的有界调和函数ｕ使（Ａ）成立。     

关于"Banach空间中非线性脉冲Volterra型积分方程的可解性"一文的商榷

举出反例指出《Banach空间中非线性脉冲Volterra型积分方程的可解性》(洪世煌,系统科学与数学. 2004, 22(2))一文主要结论的不妥之处,并提出文中在定理证明中的问题.     

关于多项式型Hammerstein积分方程的唯一正解

关于多项式型Ｈａｍｍｅｒｓｔｅｉｎ积分方程的唯一正解赵增勤（曲阜师范大学数学系，山东曲阜２７３１６５）１９９１年２月２８日收到，１９９１年１０月５日收到修改压缩稿．一、引言文［１，２］研究了Ｈａｍｍｅｒｓｔｅｉｎ型积分方程的解与固有值．本文讨论多项式...     

CONSISTENCY OF THE FIELD EQUATIONS IN THE SCALE COVARIANT THEORY OF GRAVITATION

ABSTRACT

In the theory of general relativity, it is well known that the integrability conditions for Einstein's field equations are the conservation equations. The latter guarantee that if the constraint equations G^oa = kT^oa hold on an initial surface, and if G^av = kT^av at all times, then the constraint equations will hold at all earlier and later times. This ensures the consistency of the field equations and underlies the initial value approach to their solution. We investigate the corresponding result in the scale co-variant theory of gravitation.     

伪抛物型复方程的Riemann─Hilbert初边值问题的可解性及其近似解的误差估计

本文使用参数开拓法证明了非线性伪抛物型复方程在多连通区域上的Ｒｉｅｍａｎｎ－Ｈｉｌｂｅｒｔ初边值问题的可解性，并对近似解作出了误差估计。     

半序空间中二元算子方程的可解性及应用

首先在Banach空间中,利用半序方法和锥理论,研究了混合单调算子方程Lx=N(x,y)在反向上下解条件下的耦合解的存在性.然后在完备度量空间和Banach空间中,利用半序方法和锥理论,研究算子方程Lx=N(x,x)解的存在性唯一性问题,得到了一些新结论.所得的部分结论改进了最近一些文献中的重要结果.最后,将所得的部分结果应用于非线性算子固有值与固有元的存在性的研究中.     

一四元数矩阵方程组的实部半正定解

设Ａ是一个ｎ阶实四元数方阵，若对任意的非零ｎ元列向量ｘ，有ｘＡｘ的实部非负，则称Ａ是一个实部半正定阵，本文给出了实四元数矩阵方程组。     

关于TLS问题的可解性

§1.引言如无特殊说明,本文沿用[4]中的记号和术语.Golub和Van Loan于1980年引入了下述完全最小二乘问题(简称TLS问题):