共查询到20条相似文献,搜索用时 46 毫秒
1.
研究了一类非线性耦合双曲型方程组初边值问题,讨论了初边值条件以及非线性项中指数满足的条件,利用Galerkin方法和紧致性的结果,以及椭圆型方程解的正则性定理,经过严格的推导证明了该问题解的存在唯一性的若干结果. 相似文献
2.
本文利用含间断项增算子不动点定理讨论了一类非线性Volterra型积分方程正解存在唯一性.在解存在性准则中取消了函数连续性限制,在较弱条件下得到了正解存在唯一性定理. 相似文献
3.
主要考虑如下三阶两点边值问题通过对非线性项f作适当的限制,利用上下解方法,获得三阶两点边值问题解的存在性结果.特别之处是,一个截断技巧和Nagumo条件的引入和使用.同时得到了解的唯一性结果. 相似文献
4.
5.
6.
7.
奇异拟线性椭圆型方程的可解性 总被引:1,自引:0,他引:1
本文考虑奇异拟线性椭圆型方程在球形区域中或整个空间Rn上的可解性、首先,在对拟线性算子、非线性项以及右端项系数加以适当的条件下,得到了该问题局部解的存在唯一性;然后,导出所得到的解满足一种有序性.利用这种有序性,进一步证明了该问题在以k为半径的球形区域Bk上解的存在唯一性;最后,令,便得到该问题在整个空间Rn上的整体解的存在唯一性 相似文献
8.
9.
本文讨论了非线性2m阶Dirichlet边值问题多解的存在性.在非线性项满足一定条件时,通过有效地利用锥中的不动点指数理论和解的反对称延拓法,得到关于变号解的一些新的存在结果.确切地说,得到该2m阶边值问题至少存在两个正解,两个负解和多个变号解. 相似文献
10.
杨华 《数学年刊A辑(中文版)》1988,(6)
本文讨论一类带跳的一维随机微分方程强解的存在性、唯一性,方程系数可不满足Lipschitz条件。进一步,对一类漂移系数间断,扩散系数部分退化成零的随机微分方程,文中证明了强解的存在性。 从若干关于随机微分方程的弱解、强解存在性、唯一性结果中发现,扩散系数的条件对方程解的存在性、唯一性至关重要,当漂移系数间断时,为了得到随机微分方程强解的存在性,文章[5,6,7]中均假设扩散系数非退化,本文通过用局部时分析过程轨道的逗留性质,得到强解的存在性。 相似文献
11.
S. V. Kerov 《Journal of Mathematical Sciences》1988,41(2):995-999
The asymptotic distribution of tensors of degree N in symmetry types is studied in this paper.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 155, pp. 181–186, 1986. 相似文献
12.
13.
14.
A. P. Ushakova 《Journal of Mathematical Sciences》1998,89(5):1582-1589
An estimate of stability of characterization of distribution types is obtained for the case of additive types. Under some
conditions, the estimate has the order ε1/3L(ε), where L(ε) is a slowly varying function.
Proceedings of the Seminar on Stability Problems for Stochastic Models, Moscow, Russia, 1996, Part I. 相似文献
15.
Mathematical Notes - We study the initial boundary-value problem for three-dimensional systems of equations of pseudoparabolic type. The system is similar to the Oskolkov system, but differs from... 相似文献
16.
本文研究了完全正则半群簇的子簇格[V+∩PV,V+∩PV]的某些格运算性质,我们证明了簇V+∩PV可分解为V与V+∩PV的并;对任意完全正则半群簇W,有W∩(V∨V+∩PV)=(W∩V)∨(W∩V+∩PV).特别地,我们得到了等式V+∩PV=V成立的若干条件. 相似文献
17.
Yu. N. Lin'kov 《Journal of Mathematical Sciences》1991,53(4):409-415
We give a characterization of the types of asymptotic discernibility of families of hypotheses in the case of hypothetical measures that are not, in general, mutually absolutely continuous. The case when the logarithm of the likelihood ratio admits an asymptotic expansion of the type of an expansion with local asymptotic normality is examined in detail. Examples are studied.Translated fromTeoriya Sluchainykh Protsessov, Vol. 15, pp. 64–71, 1987. 相似文献
18.
I. D. Ivanyuta 《Mathematical Notes》1969,5(1):85-88
The following theorem is proved: The product of any variety of two-step solvable groups and a variety having a finite basis of identity relations has a finite basis of identity relations.Translated from Matematicheskie Zametki, Vol. 5, No. 1, pp. 137–144, January, 1969. 相似文献
19.
20.
Varieties of Sums of Powers describe the additive decompositions of a homogeneous polynomial into powers of linear forms. The study of these varieties dates back to Sylvester and Hilbert, but only few of them, for special degrees and number of variables, are concretely identified. In this paper we aim to understand a general birational behavior of VSP. To do this we birationally embed these varieties into Grassmannians and prove the rational connectedness of many VSP in arbitrary degrees and number of variables. 相似文献