二维Monge-Ampère型方程的Neumann问题

该文通过构造闸函数将整体约化到边界,证明了二维Monge-Ampère型方程Neumann边值问题解的二阶导数估计,进而得到该方程Neumann边值问题经典解的存在性以及正则性.     

关于齐次四元Monge-Ampère方程的一些注记北大核心CSCD

本文考虑了四元数空间Hn中齐次四元Monge-Ampère方程的狄利克雷问题解的正则性.首先,当区域是边界为C1,1的强拟凸域时,作者给出了解的Lipschitz估计.其次,考虑了四元MongeAmpère算子的收敛性.最后,讨论了齐次四元Monge-Ampère方程的粘性次解与F-次调和函数之间的关系.     

关于复Monge-Ampère方程的一些研究

过去50年间,复Monge-Ampère方程是一个被广泛研究的主题,它在复分析、复几何和K?hler几何中有很多重要的应用.本文首先回顾一些经典结果,然后着重介绍关于复Monge-Ampère方程的Liouville定理、C~(1,α)估计和C~(2,α)估计,以及其在Sasakian几何中的一些应用.这些结果是与S.Dinew、管鹏飞、李超、李嘉禹和张享文等合作得到的.     

一类一般形式的抛物型Monge-Ampbre方程

对于Caffarelli-Nirenberg-Spruck提出的一种更一般形式的椭圆型Monge-AmpéFe算子det(D2u+σ),讨论与之对应的～种抛物型Monge-Ampére方程第一初边值同题.在一定的结构性条件下,利用连续性方法证明了其古典解的存在惟-性.     

黎曼流形上具有Neumann边界条件的Monge-Ampère型方程

文章研究了黎曼流形上具有N eumann边界条件的Monge-Ampère型方程的全局正则性,并将其在欧几里得空间中的主要结论推广到了曲面空间.     

Monge-Ampère方程边界爆破解的最优估计和不存在性

该文致力于研究如下Monge-Ampère方程边界爆破解的最优估计和严格凸解的不存在性M[u](x)=K(x)f(u),x∈Ω,u(x)→+∞当dist(x,?Ω)→0.这里M[u]=det(u_xixj)是Monge-Ampère算子,Ω是R^N(N≥2)中的光滑有界严格凸区域.文中不仅得到了K(x)和f(u)的各种条件之间的关系,还通过和已有文献中相关结果的比较明确了条件和估计之间的关系.并且,在Ω是一般区域的情况下给出了严格凸解不存在的结果,而这在以往文献中尚未提及.     

极小曲面方程Bernstein定理的一个推广

本文在一个平面有界集合外部考虑极小曲面方程,借助Monge-Ampère方程的性质,得到了解在无穷远处的渐近行为,扩展了经典的Bernstein定理.     

Symmetry Reduction and Exact Solutions of a Hyperbolic Monge-Amp`ere Equation

By means of the classical symmetry method,a hyperbolic Monge-Ampère equation is investigated.The symmetry group is studied and its corresponding group invariant solutions are constructed.Based on the associated vector of the obtained symmetry,the authors construct the group-invariant optimal system of the hyperbolic Monge-Ampère equation,from which two interesting classes of solutions to the hyperbolic Monge-Ampère equation are obtained successfully.     

一类二阶完全非线性抛物型方程的第一边值问题

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.     

双曲平均曲率流Cauchy问题经典解的生命跨度

本文研究了双曲平均曲率流,通过凸曲线的支撑函数,导出了一个双曲型Monge-Ampère方程并将其转化成Riemann不变量满足的拟线性双曲方程组,利用拟线性双曲方程组Cauchy问题的局部解理论,讨论了双曲平均曲率流Cauchy问题经典解的生命跨度(即局部解存在的最大时间区间).     

The equations determining intermediate integrals for Monge-Ampère PDE

In this note we will find the differential equations determining the intermediate integrals for Monge-Ampère equations in an arbitrary number of variables.

     

On Jörgens, Calabi, and Pogorelov type theorem and isolated singularities of parabolic Monge-Ampère equations

In the paper, we extend Jörgens, Calabi, and Pogorelov's theorem on entire solutions of elliptic Monge-Ampère equations to parabolic equations associated with Gauss curvature flows. Our results include Gutiérrez and Huang's previous work as a special case. Besides, we also treat the isolated singularities for parabolic Monge-Ampère equations that was firstly studied by Jörgens for elliptic case in two dimensions.     

Entire invariant solutions to Monge-Ampère equations

We prove existence and regularity of entire solutions to Monge-Ampère equations invariant under an irreducible action of a compact Lie group.

     

Approximation results by difference schemes of fracture energies: the vectorial case

In this paper we deal with Monge-Ampère type equations in two dimensions and, using the symmetrization with respect to the perimeter, we prove some comparison results for solutions of such equations involving the solutions of conveniently symmetrized problems.     

An efficient approach for the numerical solution of the Monge-Ampère equation

In this paper, we present a new method to compute the numerical solution of the elliptic Monge-Ampère equation. This method is based on solving a parabolic Monge-Ampère equation for the steady state solution. We study the problem of global existence, uniqueness, and convergence of the solution of the fully nonlinear parabolic PDE to the unique solution of the elliptic Monge-Ampère equation. Some numerical experiments are presented to show the convergence and the regularity of the numerical solution.     

Comparison results for Monge-Ampère type equations with lower order terms

In this paper we deal with Monge-Ampère type equations in two dimensions and, using the symmetrization with respect to the perimeter, we prove some comparison results for solutions of such equations involving the solutions of conveniently symmetrized problems.     

Weak Solutions of Monge-Ampére Type Equations in Optimal Transportation

This paper concerns the weak solutions of some Monge-Ampére type equations in the optimal transportation theory. The relationship between the Aleksandrov solutions and the viscosity solutions of the Monge-Ampére type equations is discussed. A uniform estimate for solution of the Dirichlet problem with homogeneous boundary value is obtained.     

The first initial-boundary value problem for fully nonlinear parabolic equations generated by functions of the eigenvalues of the Hessian

For a class of elliptic Hessian operators raised by Caffarelli-Nirenberg-Spruck, the corresponding parabolic Monge-Ampère equation was studied, the existence and uniqueness of the admissible solution to the first initial-boundary value problem for the equation were established, which extended a result of Ivochkina-Ladyzhenskaya.     

The Cauchy problem for improper affine spheres and the Hessian one equation

We give a conformal representation for improper affine spheres which is used to solve the Cauchy problem for the Hessian one equation. With this representation, we characterize the geodesics of an improper affine sphere, study its symmetries and classify the helicoidal ones. Finally, we obtain the complete classification of the isolated singularities of the Hessian one Monge-Ampère equation.

     

Space-time Estimates for Parabolic Type Operator and Application to Nonlinear Parabolic Equations

In this present paper we establish space-time estimates of solutions for linear parabolic type equations based on classical multipliers theory or operator semigroup theory. According to space-time estimates we first construct suitable work space L^q(0, T; L^P), moreover we study the Cauchy problem and initial boundary value problem for semilinear parabolic equation in L^q(0, T; L^P) type space.