阿贝尔齐性图上一种改进的关于Dirichlet特征值的Harnack型不等式

在本文中, 我们证明了在阿贝尔齐性图上一种改进的关于Dirichlet特征值的Harnack 型不等式,由此, 利用此Harnack 型不等式得到Dirichlet特征值的一个下界估计, 推广了 Chung 和 Yau 关于齐性图的一些结果.     

黎曼流形上薛定谔方程的Harnack估计

推导了薛定谔方程正解的一种新的整体梯度估计和Harnack不等式,推广了一些有关热方程的结论,并且得到了一个关于薛定谔算子的刘维尔定理.     

蜕化抛物型方程的Harnack不等式

蜕化抛物型方程的Ｈａｒｎａｃｋ不等式黄清龙（兰州大学数学系，兰州７３００００）提要本文讨论一类蜕化线性抛物型方程，证明其强解具有Ｈａｒｎａｃｋ性质．关键词：抛物型微分方程；蜕化点；Ｈａｒｎａｃｋ性质ＡＭＳ（１９９１）主囹分类：３５Ｋ６５设Ｑ（６，Ｒ）...     

黎曼流形上关于p-Laplace热方程的Harnack不等式

本文主要讨论Ｒｉｅｍａｎｎ流形上型如：ｄｉｖ（ｕ~ｐ－２ｕ）－ｕ~ｐ－２ｕ－２ｔ＝０（ｐ＞１）的非线性抛物方程（ｐ＞１）,导出其正解的局部Ｈａｒｎａｃｋ不等式,推广了文献［１,２］中的结果．     

双非线性抛物方程初始迹与Harnack不等式

在最优的初始值条件下考虑如下拟线性抛物方程的柯西问题u_t-diva(x,t,u,Du)=b(x,t,u,Du),(x,t)属于S_T=R~N×(0,T).令a(x,t,u,Du)={a_i(x,t,u,Du)},假设a_i(x,t,u,Du)与b(x,t,u,Du)皆为Caratheodory函数,并且假设它们满足Du的单调性,关于u,|Du|等一定的增长阶条件下,得到了解的比较定理,证明了解的存在性,并得到了相关的Harnack不等式.     

具有吸附项的渗流方程有界弱解的广义Harnack不等式

具有吸附项的渗流方程有界弱解的广义Harnack不等式@袁洪君@王波...     

关于Hodge-Dirac微分算子的Caccioppoli不等式

利用广义Hlder不等式、满足Dirac-调和方程的微分形式的弱逆Hlder不等式等重要引理,在已有的关于Hodge-Dirac微分算子的Caccioppoli-型不等式的基础上,首先给出局部的双权Caccioppoli-型积分不等式的参数形式.进一步,作为上述局部结论的应用,在有界域Ω上给出了相应的全局加权积分不等式.结论中的四个参数λ_1,λ_2,λ_3,α使得到的结论更具灵活性,若赋予参数以适当的值可以得到了其它经典权函数的加权积分不等式.     

A Differential Harnack Inequality for the Newell-Whitehead-Segel Equation

This paper will develop a Li-Yau-Hamilton type differential Harnack estimate for positive solutions to the Newell-Whitehead-Segel equation on R^n.We then use our LYH-differential Harnack inequality to prove several properties about positive solutions to the equation,including deriving a classical Harnack inequality and characterizing standing solutions and traveling wave solutions.     

带边紧流形上热核的Harnack不等式

１９８６年,Ｐ．Ｌｉ与丘成桐给出了带凸边界的紧黎曼流形上关于热核的一个Ｈａｒｎａｃｋ不等式（可参看［６］）,而该文的目的正是将他们的工作推广到可能带非凸边界的紧黎曼流形上．     

Harnack inequalities for fuchsian type weighted elliptic equations

Harnack type inequalities for nonnegative (weak) solutions of degenerate elliptic equations, in divergence form, are established. The asymptotic behavior of solutions of Fuchsian type weighted elliptic operators is also investigated.     

Dimension-Free Harnack Inequality and its Applications

This paper presents a self-contained account concerning a dimension-free Harnack inequality and its applications. This new type of inequality not only implies heat kernel bounds as the classical Li-Yau’s Harnack inequality did, but also provides a direct way to describe various dimension-free properties of finite and infinite-dimensional diffusion semigroups. The author starts with a standard weighted Laplace operator on a Riemannian manifold with curvature bounded from below, and then move further to the unbounded below curvature case and its infinite-dimensional settings.     

Harnack inequality for two‐weight subelliptic p ‐Laplace operators

In this note, we prove a Harnack inequality for two‐weight subelliptic p ‐Laplace operators together with an upper bound of the Harnack constant associated with such inequality. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Singular stochastic equations on Hilbert spaces: Harnack inequalities for their transition semigroups

We consider stochastic equations in Hilbert spaces with singular drift in the framework of [G. Da Prato, M. Röckner, Singular dissipative stochastic equations in Hilbert spaces, Probab. Theory Related Fields 124 (2) (2002) 261-303]. We prove a Harnack inequality (in the sense of [F.-Y. Wang, Logarithmic Sobolev inequalities on noncompact Riemannian manifolds, Probab. Theory Related Fields 109 (1997) 417-424]) for its transition semigroup and exploit its consequences. In particular, we prove regularizing and ultraboundedness properties of the transition semigroup as well as that the corresponding Kolmogorov operator has at most one infinitesimally invariant measure μ (satisfying some mild integrability conditions). Finally, we prove existence of such a measure μ for noncontinuous drifts.     

Harnack inequalities for non-local operators of variable order

We consider harmonic functions with respect to the operator

Under suitable conditions on we establish a Harnack inequality for functions that are nonnegative and harmonic in a domain. The operator is allowed to be anisotropic and of variable order.

     

Harnack inequality and smoothness for quasilinear degenerate elliptic equations

We prove local and global regularity for the positive solutions of a quasilinear variational degenerate equation, assuming minimal hypothesis on the coefficients of the lower order terms. As an application we obtain Hölder continuity for the gradient of solutions to nonvariational quasilinear equations.