Chuanqiang Chen, Dekai Zhang
In this paper, we obtain some important inequalities of Hessian quotient operators, and global $C^2$ estimates of the Neumann problem of Hessian quotient equations. By the method of continuity, we establish the existence theorem of $k$-admissible solutions of the Neumann problem of Hessian quotient equations.
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In this paper, we establish global C^2 estimates for a class of mixed Hessian equations with Neumann boundary condition, and obtain the existence theorem of k-admissible solutions for the classical Neumann problem of these mixed Hessian equations.
We prove the symmetry of solutions to overdetermined problems for a class of fully nonlinear equations, namely Hessian quotient equations and Hessian quotient curvature equations. Our approach is based on establishing a Rellich-Pohozaev type identity for Hessian quotient equations and using a P function. Our result generalizes the overdetermined problems for k-Hessian equations and k-curvature equations.
In this paper, we consider a Class of Hessian quotient equations in Euclidean space. Under some sufficient condition, we obtain an existence result by the standard degree theory based on the a prior estimates for the solutions to the Hessian quotient equations.
The Neumann Problem for Parabolic Hessian Quotient Equations
本文研究抛物型 Hessian 商方程的 Neumann 问题，证明 $k$-容许解全局存在并收敛到椭圆方程的光滑解，且经典问题解收敛到平移解。
In this paper, we consider the Dirichlet problem for a class of Hessian quotient equations on Riemannian manifolds. Under the assumption of an admissible subsolution, we solve the existence and the uniquness for the Dirichlet problem in a domain without any geometric restrictions on the boundary, based on the a priori estimates for the solutions to the Hessian quotient type equations.
Viscosity solution to complex Hessian quotient equations
本文证明了紧致Hermitian流形上复Hessian方程在粘性意义下存在严格下解时粘性解的存在性，结果涵盖复Hessian商方程，推广了以往需满足行列式支配条件的研究。
In this paper we study the {\it a priori} gradient estimates for admissible solutions to Neumann boundary value problem of fully nonlinear Hessian equations on Riemannian manifolds. We firstly derive an interior gradient estimates for admissible solutions, then we obtain boundary gradient estimates based on the interior gradient estimates we have got.
Interior Hessian estimates for sum Hessian quotient equation
本文针对和 Hessian 商方程，建立了内部 C^2 估计和 Pogorelov 型估计，并在 k=n 时给出较弱结果。
Interior estimates for Hessian quotient equations
本文证明了Hessian商方程在次数差为一或二时的内部Hessian估计，并证明该范围最优，方法结合非线性比较函数、加倍极大值原理和Pogorelov估计。
A class of sum Hessian quotient equations arising in conformal geometry
本文研究黎曼流形上带修正Schouten张量的和型Hessian商方程的(n-1)-容许解的存在性，通过建立一致先验估计，利用度理论证明其可解性。
In this paper, we study the Dirichlet problem of Hessian quotient equations in exterior domains. By estimating the eigenvalues of the solution, the necessary and sufficient conditions on existence of radial solutions are obtained. Applying the solutions of ODE, the viscosity subsolutions and supersolutions are constructed and then the existence of viscosity solutions for exterior problems is established by the Perron's method.
The Neumann problem for a class of degenerate Hessian quotient type equations
本文研究退化Hessian商类型算子的重要不等式，推导了Neumann问题的全局先验估计及存在性定理，扩展了k的可接受范围。
In this paper, we establish the existence and uniqueness theorem for solutions of the exterior Dirichlet problem for Hessian quotient equations with prescribed asymptotic behavior at infinity. This extends the previous related results on the Monge-Ampère equations and on the Hessian equations, and rearranges them in a systematic way. Based on the Perron's method, the main ingredient of this paper is to construct some appropriate subsolutions of the Hessian quotient equation, which is realized by introducing some new quantities about the elementary symmetric functions and using them to analyze …
In this paper, we consider the exterior Dirichlet problem for Hessian quotient equations with the right hand side $g$, where $g$ is a positive function and $g=1+O(|x|^{-β})$ near infinity, for some $β>2$. Under a prescribed generalized symmetric asymptotic behavior at infinity, we establish an existence and uniqueness theorem for viscosity solutions, by using comparison principles and Perron's method. This extends the previous results for Monge--Ampère equations and Hessian equations.
On Liouville's theorem for the Hessian quotient equation $σ_2/σ_1$
本文证明了Hessian商方程σ₂/σ₁=1在Rⁿ中半凸整个解的Liouville定理，通过将商算子转化为σ₂算子并引用Shankar和Yuan的结果。
Interior Hessian estimates for k-convex solutions of Hessian quotient equations with 2k>n
针对满足2k>n的Hessian商方程，利用凹性不等式和逐点加倍论证，建立了k凸解的内部Hessian估计。
Interior Hessian estimates for $k$-convex solutions of Hessian quotient equations
针对Hessian商方程的$k$-凸解，采用Li-Wu的定量分离传播法推导加倍不等式，结合Shankar-Yuan的紧性论证得到内部Hessian估计，该方法也适用于一类一般Hessian方程。
Interior $C^2$ estimate for Hessian quotient equation in dimension three
本文针对三维 Hessian 商方程，利用 Jacobi 不等式建立了内部 $C^2$ 估计，是该领域的重要进展。
Interior Hessian estimates for Hessian quotient equations
研究针对$l=k-1$和$l=k-2$情形的一般Hessian商方程，借助半凸条件下Hessian商算子的定量凹性不等式，建立了容许半凸解的内部$C^2$估计，为任意维数下对应范围的该类方程提供了统一论证。
In this paper, we consider the Neumann problem of a class of mixed complex Hessian equations, and establish the global C^1 estimates a nd reduce the global second derivative estimate to the estimate of double normal second derivatives on the boundary. In particular, we can prove the global C^2 estimates and the existence theorems when k=n.
Interior $C^{2}$ estimate for semi-convex solutions to a class of Hessian quotient equations in arbitrary dimensions
研究Hessian商方程在任意维度下的内部$C^2$估计，探讨半凸条件下的椭圆性，并推导相应求和Hessian方程的结果，同时建立若干刚性结论。
Hessian Estimates for Convex Solutions of Hessian Quotient Equations via Compactness
本文通过紧致性方法，为两类 Hessian 商方程的凸解建立了内部 Hessian 估计，并改进了 Lu 和 Fung 的证明。
Neumann Problems for Elliptic and Parabolic Sum Hessian Equations
本文研究与 Hessian 方程的 Neumann 边值问题，在几乎凸且一致 $(k-1)$-凸区域中建立 $(k-1)$-容许解的先验 $C^2$ 估计与存在性，并推广至一致凸区域及抛物型情形。
Existence of classical solutions to the exterior Dirichlet problem for Hessian quotient equations
本文针对右端非恒定的Hessian商方程外狄利克雷问题，通过构造半径无关的边界到内部估计与爆破论证，证明了经典容许解的存在性及无穷远处Hessian的收敛性，还处理了源项非径向扰动等情形。
A Concavity Inequality for Hessian Quotient Equations
本文利用对称多项式基变换证明Hessian商算子σ_k/σ_{k-1}的凹性不等式，消除了相关方程凸解C²估计的额外假设，还得到初等对称多项式的若干有用不等式。
Interior Hessian estimates for Hessian quotient equations in dimension three
本文研究了三维中2凸解的内部Hessian估计，以及更高维中半凸解的估计，并提出新方法证明光滑解的倍增不等式，同时在更高维中引入动态半凸性条件。
The Neumann problem for a class of Hessian quotient type equations
针对右端含梯度项的一类 Hessian 商方程 Neumann 问题，论文在增长条件下建立 $(\Lambda,k)$-凸解的内部梯度估计，并据此获得全局先验估计与存在性定理。
Exterior Dirichlet Problems for Hessian Quotient Equations of Mixed Type
本研究针对混合型Hessian商方程的外狄利克雷问题，通过三阶段次解构造证明了具有指定二次无穷远渐近行为的光滑容许解的存在与唯一性，并得到余项的全导数衰减。
The existence of $(\mathbf{p}, k)$-convex hypersurfaces for a class of Hessian quotient type curvature equations
本文研究了一类Hessian商型曲率方程中闭合星形超曲面的存在性，结合先验估计与连续方法，证明了非齐次和齐次方程的(p,k)-凸超曲面存在性和唯一性，并利用新发现的『逆凸性』性质，证明了常秩定理，从而获得严格凸解的存在性和唯一性。
Interior derivative estimates and Bernstein theorem for Hessian quotient equations
本文针对椭圆型和抛物型Hessian商方程建立了内部导数估计，并在此基础上证明了抛物型Hessian商方程的Bernstein定理，刻画了全局抛物凸解必为线性时间项与凸二次多项式之和的形式。
A concavity inequality and interior $C^2$ estimate for Hessian quotient equations
该研究建立了特定参数下Hessian商算子的凹性不等式与对应Jacobi不等式，结合已有框架得到Hessian商方程凸解的内部Hessian估计，并证明了具有二次增长的整体凸解必为二次多项式。
The oblique boundary value problem for degenerate Hessian quotient type equations
本文针对光滑有界域中的退化Hessian商型方程斜边值问题，在无几何限制条件下，于指定函数类中建立先验估计，得到$C^{1,1}$解的存在与唯一性结果。
Dirichlet problem for degenerate Hessian quotient type curvature equations
本文研究退化Hessian商型曲率方程的Dirichlet问题，在特定正则性条件下证明 $C^{1,1}$ 图形超曲面的存在唯一性，并给出退化Hessian型方程在最优条件下的二阶导数估计。
Doubling Argument of the Hessian Estimate for the Hessian Quotient Equations
本文针对特定条件下的黑塞商方程，建立逐点加倍论证来获取凸解的黑塞估计，不依赖勒让德变换等，还给出反例说明结构假设的必要性，最后将论证扩展到一般黑塞商方程。
We show the $C^0$ estimate for solutions to Hessian quotient equations on hyperKähler with torsion manifolds without any additional assumption on its hypercomplex structure by a clever use of the cone condition directly.
The $L_p$ dual Christoffel-Minkowski type problem for a class of Hessian quotient equations
本文研究了Hessian商算子σ_k(Λ)/σ_l(Λ)的L_p对偶Christoffel-Minkowski类型问题，利用新发现的'逆凸性'性质，在适当结构假设下建立了满秩定理，并结合先验估计证明了严格球面凸解的存在性和唯一性。
Recently, the first named author together with Xinan Ma \cite{ma2015neumann}, have proved the existence of the Neumann problems for Hessian equations. In this paper, we proceed further to study classical Neumann problems for Hessian equations. We prove here the existence of classical Neumann problems under the uniformly convex domain in R^n. As an application, we use the solution of the classical Neumann problem to give a new proof of a family of Alexandrov-Fenchel inequalities arising from convex geometry. This geometric application is motivated from Reilly \cite{Reilly1980}.
Interior $C^2$ estimate for Hessian quotient equation in general dimension
针对一般维数下 Hessian 商方程的内部 $C^2$ 正则性问题，论文证明该估计在 $k=n-1,n-2$ 时成立，并在 $k\leq n-3$ 时以奇异解证明其失效。
In this paper, we consider a class of Hessian quotient equations in the warped product manifold $\overline{M}=I\times_λM$. Under some sufficient conditions, we obtain an existence result for the star-shaped compact hypersurface $Σ$ in $\overline{M}$ using standard degree theory based on a priori estimates for solutions to the Hessian quotient equations.
It is well-known that a celebrated Jörgens-Calabi-Pogorelov theorem for Monge-Ampère equations states that any classical (viscosity) convex solution of $\det(D^2u)=1$ in $\mathbb{R}^n$ must be a quadratic polynomial. Therefore, it is an interesting topic to study the existence and uniqueness theorem of such fully nonlinear partial differential equations' Dirichlet problems on exterior domains with suitable asymptotic conditions at infinity. As a continuation of the works of Caffarelli-Li for Monge-Ampère equation and of Bao-Li-Li for $k$-Hessian equations, this paper is devoted to the solvabil…
Pogorelov type interior $C^2$ estimate for Hessian quotient equation and its application
针对Hessian商方程建立Pogorelov型内部$C^2$估计，并据此给出凸粘性解在两类尖锐正则性阈值下的正则性结论。
A special concavity property for positive Hessian quotient operators
该研究建立了正Hessian商算子的特殊凹性性质，并以此证明了黎曼流形上满足对应方程的一般对称张量的Jacobi不等式，丰富了相关算子的性质研究。
The Neumann Problem for Hessian Equations
本文证明了一致凸区域中Hessian方程Neumann边界问题经典解的存在性，通过建立二阶先验导数估计，肯定回答了Trudinger 1986年的猜想。
The Dirichlet problem for Hessian quotient type curvature equations in Minkowski space
针对非凸区域，在不假设下解和Serrin型条件下建立先验估计，证明闵可夫斯基空间中一类Hessian商型曲率方程Dirichlet问题的存在性。
Remarks on Hessian quotient equations on Riemannian manifolds
针对 Delanoë 和 Urbas 提出的相关问题，本文在二维黎曼流形上利用新测试函数与商算子凹性，证明实 Hessian 商方程具有无障碍二阶先验估计，并揭示其与复几何中 $J$-方程障碍的差异。
The Hessian quotient equatio were studied for k-th symmetric elementary function S_k(D^2u) of eigenvalues of the Hessian matrix D^2u. Two pointwise quadratic growth conditions were found by Bao-Cheng-Guan-Ji ([1], American J. Math., 2003, 125, 301-316) ensuring Bernstein properties of Hessian quotient equation or k-Hessian equation respectively. In this paper, we will drop the point wise quadratic growth condition of [1] and prove three necessary and sufficient conditions to Bernstein property of (0.1) and (0.2), using a reverse isoperimetric type inequality, volume growth or Lp-integrable res…
Hessian estimates for Dirichlet and Neumann eigenfunctions of Laplacian
本文借助 Riemannian 流形上的随机分析，建立带边界紧流形中 Laplacian 的 Dirichlet 特征函数 Hessian 上下界及尖锐增长估计，并推广至 Neumann 情形。
Pogorelov type interior $C^2$ estimate for sum Hessian quotient equations on Riemannian manifolds
针对黎曼流形上一类和Hessian商方程，建立了测地球中心处的内部$C^2$估计以及带零Dirichlet边界的Pogorelov型估计。
Let $Ω$ be a bounded domain (with smooth boundary) on the hyperbolic plane $\mathscr{H}^{n}(1)$, of center at origin and radius $1$, in the $(n+1)$-dimensional Lorentz-Minkowski space $\mathbb{R}^{n+1}_{1}$. In this paper, by using a priori estimates, we can establish Pogorelov type estimates of $k$-convex solutions to a class of Hessian quotient equations defined over $Ω\subset\mathscr{H}^{n}(1)$ and with the vanishing Dirichlet boundary condition.
A Serrin-type over-determined problem for Hessian equations in the exterior domain
研究外区域Hessian方程的超定问题，证明存在唯一有界区域使问题有唯一严格凸解。
The curvature estimates of quotient curvature equation do not always exist even for convex setting \cite{GRW}. Thus it is natural question to find other type of elliptic equations possessing curvature estimates. In this paper, we discuss the existence of curvature estimate for fully nonlinear elliptic equations defined by symmetric polynomials, mainlly, the linear combination of elementary symmetric polynomials.
In this paper, we study fully nonlinear second-order elliptic and parabolic equations with Neumann boundary conditions on compact Riemannian manifolds with smooth boundary. We derive oscillation bounds for admissible solutions with Neumann boundary condition $u_ν= ϕ(x)$ assuming the existence of suitable $\mathcal{C}$-subsolutions. We use a parabolic approach to derive a solution of a $k$-Hessian equation with Neumann boundary condition $u_ν= ϕ(x)$ under suitable assumptions.
Overdetermined problems for sum Hessian equations in the space forms
本文研究空间形式中规范化Hessian和方程及其商方程的过定问题，证明在星形或Dirichlet值上界条件下区域为测地球，并推广至无星形假设情形，方法为辅助函数与Rellich–Pohožaev恒等式。
In this paper, we study global regularity for oblique boundary value problems of augmented Hessian equations for a class of general operators. By assuming a natural convexity condition of the domain together with appropriate convexity conditions on the matrix function in the augmented Hessian, we develop a global theory for classical elliptic solutions by establishing global a priori derivative estimates up to second order. Besides the known applications for Monge-Amp`ere type operators in optimal transportation and geometric optics, the general theory here embraces prescribed mean curvature p…
In this paper, we consider Hessian equations with its structure as a combination of elementary symmetric functions on closed Kähler manifolds. We provide a sufficient and necessary condition for the solvability of these equations, which generalize the results of Hessian equations and Hessian quotient equations.
A $C^2$ function on $\mathbb{R}^n$ is called strictly $(n-1)$-convex if the sum of any $n-1$ eigenvalues of its Hessian is positive. In this paper, we establish a global $C^2$ estimates to the Monge-Ampère equation for strictly $(n-1)$-convex functions with Neumann condition. By the method of continuity, we prove an existence theorem for strictly $(n-1)$-convex solutions of the Neumann problems.
The Neumann problem of special Lagrangian type equations
该研究针对带临界与超临界相位的特殊拉格朗日型方程Neumann问题，通过建立二阶一致先验估计、直接证明边界双法向导数估计等技术，结合连续性方法得到存在性结果，还解决了经典Neumann问题。
In this paper, we mainly establish the existence and uniqueness theorem for solutions of the exterior Dirichlet problem for a class of fully nonlinear second-order elliptic equations related to the eigenvalues of the Hessian, with prescribed generalized symmetric asymptotic behavior at infinity. Moreover, we give some new results for the Hessian equations, Hessian quotient equations and the special Lagrangian equations, which have been studied previously.
We treat the exterior Dirichlet problem for a class of fully nonlinear elliptic equations of the form $$f(λ(D^2u))=g(x),$$ with prescribed asymptotic behavior at infinity. The equations of this type had been studied extensively by Caffarelli--Nirenberg--Spruck \cite{Caffarelli1985}, Trudinger \cite{Trudinger1995} and many others, and there had been significant discussions on the solvability of the classical Dirichlet problem via the continuity method, under the assumption that $f$ is a concave function. In this paper, based on the Perron's method, we establish an exterior existence and uniquen…
A viscosity approach is introduced for the Dirichlet problem associated to complex Hessian type equations on domains in $\C^n$. The arguments are modelled on the theory of viscosity solutions for real Hessian type equations developed by Trudinger. As consequence we solve the Dirichlet problem for the Hessian quotient and special Lagrangian equations. We also establish basic regularity results for the solutions.
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