共查询到20条相似文献,搜索用时 265 毫秒
1.
证明了二阶完全非线性抛物型方程周期粘性解的存在唯一性,在标准假设下解决了非线性抛物型方程古典周期解的存在唯一性问题。 相似文献
2.
在自然结构条件下证明了具有初值和非线性斜边值的二阶完全非线性抛物方程障碍问题W~(2.1)_∝强解的存在唯一性. 相似文献
3.
将Riemann函数方法与不动点理论有效地结合起来,研究了一类一维非线性伪抛物型方程的后向热流问题,得出了反问题解的存在唯一性结论. 相似文献
4.
本文讨论了一类时滞非线性伪抛物型方程Cauchy问题有界解的存在唯一性问题 ,给出了有界解存在唯一的充分条件 . 相似文献
5.
6.
基于C.C.Travis和G.F.Webb等人对时滞问题的研究,作者曾在[5]中对一类被称为带正时滞臂的时滞抛物型问题进行了讨论。本文在[5]的基础上继续讨论此类问题。对于抽象时滞问题,在非线性项满足局部Lip连续(甚至对某些变元仅仅是H?lder连续)及一定的增长性限制的条件下,我们对非线性项作了较精细的估计,用半群方法得到了解的存在性和唯一性。进一步,对带零时滞臂的抛物型问题,我们先用上面的结果建立逼近方程,用紧性方法在较弱的条件下也得到了解的存在性。 其次,我们将所得到的抽象结果应用于二阶时滞抛物型 相似文献
7.
保继光 《数学年刊B辑(英文版)》1993,(3)
本文研究一类二阶完全非线性抛物型方程f(—u_t,λ(D~2u—σ(x,t,u)))=ψ(x,t)的第一边值问题,其中σ是实对称矩阵,λ是 D~3u—σ的特征值,f 是凹函数.利用辅助函数的方法和矩阵特征值的知识得到了解的 C~(2,1)先验估计,并借助隐函数定理证明了解的存在唯一性定理.这个工作将抛物型:Monge-Ampére 算子的结果推广到了一般情形. 相似文献
8.
该文研究一个描述药物作用下肿瘤生长的数学模型,这个肿瘤模型是对Jackson模型的一个改进,其数学形式是由一个二阶非线性抛物型方程与两个一阶非线性偏微分方程组耦合而成的自由边界问题.通过运用抛物型方程的L~P理论与一阶偏微分方程的特征方法,并利用Banach不动点定理,证明了该问题存在唯一的整体经典解. 相似文献
9.
本文首先讨论了一个非局部边界条件下的抛物型偏微分方程组,通过一个变量替换,使得在更宽松的边界假设条件下证明了解的存在唯一性;然后讨论了一个完全非线性的抛物型方程组,同样,通过变量替换证明了比较原理. 相似文献
10.
11.
12.
13.
Jason J. Sharples 《Journal of Differential Equations》2004,202(1):111-142
We consider linear parabolic equations of second order in a Sobolev space setting. We obtain existence and uniqueness results for such equations on a closed two-dimensional manifold, with minimal assumptions about the regularity of the coefficients of the elliptic operator. In particular, we derive a priori estimates relating the Sobolev regularity of the coefficients of the elliptic operator to that of the solution. The results obtained are used in conjunction with an iteration argument to yield existence results for quasilinear parabolic equations. 相似文献
14.
The authors prove a new Carleman estimate for general linear second order parabolic equation with nonhomogeneous boundary conditions. On the basis of this estimate, improved Carleman estimates for the Stokes system and for a system of parabolic equations with a penalty term are obtained. This system can be viewed as an approximation of the Stokes system. 相似文献
15.
UNIQUENESS OF VISCOSITY SOLUTIONS OF FULLY NONLINEAR SECOND ORDER PARABOLIC PDE''''S 总被引:1,自引:0,他引:1
This paper investigates the maximum principle for viscosity solutions of fully nonlinear, second order parabolic, possibly degenerate partial differential equations. Using this maximum principle the anthor prove that viscosity solutions of initial and bo unoary value problem for parabolic equations are unique. 相似文献
16.
Yu. A. Dubinskii 《Journal of Mathematical Sciences》1991,56(4):2557-2607
The basic results and methods of the theory of high order nonlinear parabolic equations are described. In the first chapter boundary problems for quasilinear parabolic equations having divergent form are considered. In the second chapter nonlinear parabolic equations of general form are considered. Attention is mainly paid to methods of study of nonlinear parabolic problems. In particular, the methods of monotonicity and compactness, the method of a priori estimates, the functional-analytic method, etc. are described.Translated from Itogi Nauki i Tekhniki, Seriya Sovremennye Problemy Matematiki, Noveishie Dostizheniya, Vol. 37, pp. 89–166, 1990. 相似文献
17.
Tubaro Luciano 《随机分析与应用》2013,31(2):217-230
We study a class of second order (in the drift term) stochastic partial differential equations by the stochastic characteristics method, as developped by Kunita for the first order stochastic partial differential equations. With this method the original problem is transformed in a family of deterministic parabolic problems. 相似文献
18.
Romuald Maecki Pawe Olszewski Jacek Urbanowicz Wojciech Urbaski 《Mathematical Methods in the Applied Sciences》1990,13(3):249-261
The non-linear contact problem for the parabolic system of second order in the sense of Pietrovski, which is the generalization of the problem considered in Part I (preceding paper), is formulated. The matrix of fundamental solutions for parabolic systems of second order with coefficients containing unknown functions and their first-order derivatives is constructed and used to reduce the problem to the equivalent system of integral equations which is then reduced to a system of Volterra type of the second kind. The existence of the solution of the system obtained is proved by using the Schauder fixed-point theorem. 相似文献
19.
《复变函数与椭圆型方程》2012,57(4):257-270
In [], the authors discussed the Tricomi problem of second order mixed equations with nonsmooth degenerate line, but they only consider some special mixed equations. In [], the author discussed the uniqueness of solutions of the Tricomi problem for some second order mixed equations with nonsmooth degenerate line. The present article deals with oblique derivative problems for general second order mixed equations with nonsmooth parabolic degenerate line, and prove the uniqueness of solutions of the problems. We first give the formulation of the problems for the equations, and then prove the uniqueness of solutions for the above problems. 相似文献
20.
刘小华 《高等学校计算数学学报(英文版)》2001,10(1)
1 IntroductionConsider the nonlinear parabolic initial-boundary problem:φ( x,u) ut- di,j=1 xj( aij( x,u) u xi) - di=1bi( x,u) uxi =f ( x,u) ( x,t)∈Ω× ( 0 ,T]u( x,0 ) =u0 ( x) x∈Ωu( x,t) =0 ( x,t)∈ Ω× ( 0 ,T]( 1 .1 )where ut= u t,uxi= u xi.Ω is a bounded domain in Rd with a smooth boundary Ω.Supposeφ( x,u) =1 ,bi( x,u) =0 in( 1 .1 ) ,Douglas and Dupont[1 ] formulated severalGalerkin procedures in 1 970 called Crank-Nicolson-Galerkin approximation,predictor-co… 相似文献